Some results af Abrikosov's theory concerning the properties of the mixed stage of type- ... Abrikosov reached, on the basis of the Ginsburg-Landau theory, ...

by the Abrikosov relation I with a. Ginzburg-Landau parameter which varied linearly with temperature. i . A.A.. Abrikosov,. "Fundamentals of the Theory ...

Theory So- lutions for the Magnetic. Flux Density and the Su- percurrent. Density. Around an Elliptical. Abrikosov. Vortex," scheduled for the January ...

theory, which is to treat the superelectrons as having a uniform den- ..... Abrikosov, A. A., On the Magnetic Properties of Superconductors of the Second ...

The very form of this Hamiltonian suggests making use of time- dependent perturbation theory, by going to the interaction repre sentation (Abrikosov et al. ...

following from Thomas-Fermi theory (as used by Hubbard and. Lampe ); ..... Abrikosov observes, only hydrogen and helium will melt at ...

hydrodynamics; quantum field theory;. elementary particles; plasma physics. Teacher School: Pomeranchuk; E. & I. Lifshits; Abrikosov; ...

S T U V W X Y Z A Abrikosov, Alexei Abrikosov, Alexei: Publications activated complex theory of reaction rates adenosine triphosphate AEC Information Retrieval Experiment Alpha...

1 #12; I. INTRODUCTION Recently Kim and Overhauser (KO) 1 showed the following: (i) Abrikosov and Gor was confirmed by Abrikosov, Gor'kov and Dzyaloshinskii, 4 and was also shown by other workers. 5\\Gamma7� ment on Ref. 1, Abrikosov and Gor'kov 8 argued that the correction term disappears in the Eliashberg

Recently it was shown 1;2 that the Abrikosov and Gor'kov's 3;4 Green's function theory of impure a BCS type theory with different predictions from the pair�breaking theory of Abrikosov and Gor'kov. 3 pointed out 13 that the failure of Green's function theory comes from ...

P. W. Anderson and Y. B. Kim, "Hard Superconductivity: Theory of the Motion of Abrikosov Lines," Rev. Mod. Phys. , 36, 39 (1964). ...

One usually employs a more or less simplified theory, and correspondingly ...... The equations of state according to Abrikosov, Ramsey, and Davydov have ...

A variational wavefunction proposed by Abrikosov is used to express ... most recent treatments of metallic hydrogen have used perturbation theory ...

effective superconducting devices. This recent progress has been achieved with type. II superconductors. The. Abrikosov theory of type. II superconductors ...

Abrikosov,. Fundamentals of the. Theory of. Metals,p. 325. (North. Holland,. Amsterdam,. 1988). 17. L.J�. Swartzendruber, ...

Abrikosov vortices) in these type-II superconductors plays a decisive r51e here. ..... theory for a moving vortex [23] or vortex lattice [24]. ...

... Thit behavior is contrary to observations on all other materials with the addition of a local magetic moment and the theory of Abrikosov and Gor'kov. ...

within the framework of the BCS theory. This is achieved ...... See, for instance, A. A. Abrikosov, L. P. Gorkov, and I. Ye. Dzyalo- ...

See, for example, A. A. Abrikosov, L. P. ~or'kov' and I. E.. Dzyaloshinsky, Methods of Quantum Field Theory in Statistical. Physics. ...

The basic ideas of flux-creep theory (i.e., theory of motion of quantized flux lines) for hard superconductors are reviewed and evaluated. The qualitative predictions of this theory are compared with experimentally observed phenomena. (T.F.H.)

Anisotropic London theory is used to predict the Abrikosov flux lattice for arbitrary field orientations in crystals of YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta

review the recent progress in the theory of inhomogeneous super� conductors. It was shown that Gor ...................... 14 1.4. Pairing constraint on Gor'kov formalism .................................................. 19 superconductors .. 81 3. ``Theory of impure superconductors: Anderson versus Abrikosov and Gor'kov'', Yong

. Leggett (1938- ) shared the 2003 Nobel Prize in physics with Alexei A. Abrikosov and Vitaly L. Ginzburg for "pioneering contributions to the theory of superconductors and superfluids." Leggett formulated the decisive theory explaining how atoms interact and are ordered in the superfluid state. Leggett joined the U of I

1342 (1959); A. A. Abrikosov, L. P. Gor'kov and I. Ye Dzyaloshinskii,. Methods of Quantum Field Theory in Statisticql Physics (Prentice-Hall, ...

L. D. Dudkin and N. Kh. Abrikosov, On The Doping of the. Semiconducttor Compound CoSb, Sov. .... The basic theory and operation of thermoelectric devices ...

the Abrikosov theory for type-II superconductors. Instead, the data fit well into the picture ofJosephson decoupling between the CuO2 layers[8]. ...

Anderson, P. W. ; and Kim, Y. B. : Hard Superconductivity: Theory of the Motion of. Abrikosov Flux Lines. Rev. Mod. Phys., vol. 36, no. 1, pt. 1, Jan. 1964, ...

and whether the standard theory can be applied. .... A. A. Abrikosov, Astron. Zh . 31, 112. (1954). [11] J. L. Calais, Arkiv. Fysik. 29, 255 (1965). ...

To incorporate the effects of pinning due to defects and predict size- dependence and hysteresis in the magnetization curves of hard superconductors, the AbrikosovCoodman theory is developed. The interaction forces between fluxoid filaments are determined semiempirically. The method developed is illustrated by application to a simple case. ...

Abrikosov, A.A., L.P. Gorkov and I . E. Dsyaloshinski, Methods of uq antum field theory in statistical. X-k� r^eie , Dover, New York, 1963. ...

the condition for the validity of the theory of Ganguly et al. [6]. ... Suhl, H. , Matthias, B. T., Abrikosov, A. A., Gorkov, L. P.,. J. Ex tl. Theoret. ...

A.A. Abrikosov, L.P. Gorkov, and I.E. Dzyaloshinski,. Methods of Quantum Field Theory in Statistical Physics. (Prentice Hall, Inc., Englewood Cliffs, 1963), ...

Abrikosov, A.A., Gorflcov, L.P., Dzyaloshinskiy, N.Ye., Metody kvantovoy teorii polya v statisticheskoy fizike [Quantum Field Theory Methods in ...

Reference to the Ginzburg-Landau-Abrikosov-Gor'kov phenomenological theory(l2-14 ) indicated that no enhancement of the critical field of a Type ...

be encompassed within a theory based on the assumption of ..... A. A. Abrikosov and L. P. Gor'kov, J. Exptl. Theoret. Phys. (U.S.S.R.) - ...

We calculate the effects of paramagnetic impurities on the critical temperature of several intermediate and strong coupling superconductors by numerically solving the Eliashberg equations, and compare the results with the results of Abrikosov-Gorkov theory. For all the superconductors considered, the values of critical impurity concentration obtained from ...

Using the virial theorem discovered recently by Doria, Gubernatis, and Rainer (Phys. Rev. B 39, 9573 (1989)), we rederive Abrikosov's solution of the Ginzburg-Landau equations near {ital H}{sub {ital c}2} in a very simple way. We stress the importance of the virial theorem for an intuitive understanding of the vortex state and report a generalized version of it, which ...

Abrikosov-Gor�kov (AG) theory, the foundation for understanding pair-breaking effects in conventional superconductors, is inadequate when there is an excitation gap (pseudogap) present at the onset of superconductivity. In this paper we present an extension of AG theory within two important, and diametrically opposite, approaches to ...

and Superconductivity · Resources with Additional Information · Publications at ANL Alexei A. Abrikosov of the U.S. Department of Energy's Argonne National Laboratory...

We discuss the non-Abelian topological objects, in particular the non-Abrikosov vortex and the magnetic knot made of the twisted non-Abrikosov vortex, in two-gap superconductor. We show that there are two types of non-Abrikosov vortex in Ginzburg-Landau theory of two-gap superconductor, the D-type which has no ...

An evaluation was made of H/sub c2/, the lower critical field or the maximum field in which the sample can be completely superconducting. Abrikosov's calculations of H/sub c2//H/sub cb/ were repeated using a high-speed computer, and the results are plotted along with Abrikosov's results. The results were also applied to recent ...

We discuss the superconducting properties of Al-Eu alloys with Eu concentrations in the range of 0-5000ppm. The electron-transport and tunneling properties are discussed in the context of Abrikosov-Gor'kov pair-breaking and Kaiser resonant-scattering theories. This complements previous work on the Al-Mn system.

A randomly diluted lattice of Josephson tunnel junctions is used as a model to generate a replicated Landau-Ginzburg field theory describing the properties of diluted superconductors near the percolation threshold. The model predicts Meissner and Abrikosov phases and a spin-glass phase with frozen currents, a nonvanishing Edwards-Anderson order parameter, ...

We investigate effects of disorder and thermal fluctuations on the Abrikosov state of type II superconductors applying the Monte Carlo method to Ginzburg-Landau theory to confirm earlier replica calculation. The vortex phase diagram has two transition lines, the melting line and the vortex glass transition lines in both crystalline and homogeneous states. ...

A. A. Abrikosov and I. M. Khalatnikov, Rep. Prog. Phys._�2, 329(1959). 4. The formal theories currently used in calculations are not consistent with ...

in the Abrikosov and Gor'kov's (AG) theory, 4 which is inconsistent with Anderson's theorem. 5 (Details condition in Gor'kov's formalism. 12 The resulting self�consistency equation is nothing but another form c nff is a destruction operator of the electron. The Gor'kov's Anomalous Green's function F (r; r 0

In most undergraduate courses the relationship between GLAG theory (due to Ginzburg, Landau, Abrikosov and Gor'kov) which is macroscopic and the BCS theory of Bardeen, Cooper and Schrieffer which is microscopic is too difficult to establish. The present paper, however, gives approximate GLAG solutions to the relations between ...

We investigate the vortex lattice solution in a (2+1)-dimensional holographic model of superconductors constructed from a charged scalar condensate. The solution is obtained perturbatively near the second-order phase transition and is a holographic realization of the Abrikosov lattice. Below a critical value of the magnetic field, the solution has a lower free energy than the ...

We investigate the vortex lattice solution in a (2+1)-dimensional holographic model of superconductors constructed from a charged scalar condensate. The solution is obtained perturbatively near the second-order phase transition and is a holographic realization of the Abrikosov lattice. Below a critical value of the magnetic field, the solution has a lower free energy than the ...

A magnetic field will break the time-reversal symmetry of the superconducting condensate pairing, giving rise to a pair-breaking effect. This pairbreaking has been confirmed by our recent far-infrared transmission and reflection measurement of a superconducting NbTiN thin film in an in-plane magnetic field. The complex optical conductivity was extracted, and the optical gap was obtained from its ...

Abrikosov's perturbation-theory treatment of the s-d problem is first reviewed and then generalized to derive an integral equation for the vertex part of the self-energy at nonzero temperature incorporating the effects of the non-spin-dependent impurity potential. The equation obtained is manifestly identical to Suhl's Low equation for the "energy-shell" ...

A study of the irreversibility lines of a silver-sheathed Bi2223 superconducting tape with a critical temperature of 108 K is presented for Hc and H?c. The irreversibility lines can be fifted to an exponential form and appear at higher temperature in comparison with those of sintered polycrystalline Bi2223. The irreversibility line of this material depends on flux pinning properties. The ...

Superconductivity on the surface of topological insulators is known to be anisotropic and unconventional in that the symmetry is the mixture of s-wave and nodeless p-wave component under certain conditions. In contrast to Anderson's theorem for the insensitivity of the s-wave superconducting critical temperature to the nonmagnetic (time-reversal symmetric (TRS)) impurities, anisotropic ...

We introduce a random matrix ensemble for bulk type-II superconductors in the mixed state and determine the single-particle excitation spectrum using random matrix theory. The results are compared with planar tunnel junction experiments in PbBi/Ge thin films. More low energy states appear than in the Abrikosov-Gor{close_quote}kov-Maki or Ginzburg-Landau ...

Using analytic and numerical techniques Nielsen-Olesen vortices, which in the context of Ginzburg-Landau theory are known as Abrikosov vortices of type-II superconductors, are studied for large Ginzburg-Landau parameter ?. We show that their energy is equal to (?n2/2)log?? to leading order, where n is the winding number of the vortex, and find that the ...

The role of pair breaking effects on the isotope effect coefficient is investigated using the generalized Abrikosov and Gorkov theory of superconductors. It is found that the pair breaking effects enhance the isotope effect coefficient. This provides a plausible explanation for the enhancement of the isotope effect coefficient as a function of impurity ...

This thesis addresses the effects of thermal fluctuations and Landau quantization of electron levels on the superconducting state in an external magnetic field. The author demonstrates the limitations of standard Abrikosov-Gorkov phenomenological theory in certain regions of the H-T phase diagram. Large thermal fluctuations exist in the mixed phase of 2D ...

We explore the behavior of a system that consists of a photon mode dipole coupled to a medium of two-level oscillators in a microcavity in the presence of decoherence. We consider two types of decoherence processes, which are analogous to magnetic and nonmagnetic impurities in superconductors. We study different phases of this system as the decoherence strength and the excitation density are ...

We explore the behavior of a system that consists of a photon mode dipole coupled to a medium of two-level oscillators in a microcavity in the presence of decoherence. We consider two types of decoherence processes, which are analogous to magnetic and nonmagnetic impurities in superconductors. We study different phases of this system as the decoherence strength and the excitation density are ...

We report the complex optical conductivity of a superconducting thin film of Nb0.5Ti0.5N in an external magnetic field. The field was applied parallel to the film surface and the conductivity extracted from far-infrared transmission and reflection measurements. The real part shows the superconducting gap, which we observe to be suppressed by the applied magnetic field. We compare our results with ...

The theory of pure type-II superconductors at high magnetic fields and low temperatures has recently attracted much attention due to the discovery of de Haas-van Alphen oscillations deep in the vortex state. In this article the authors review the state of the art in this rapidly growing new field of research. The very existence of quantum magnetic oscillations deep in the ...

We discuss the physics of the vortex state in a {ital d}-wave superconductor, using the phenomenological Ginzburg-Landau theory, where many unusual phenomena arise from the small admixture of the {ital s}-wave component induced by spatial variations in the dominant {ital d} wave. Properties of an isolated vortex and of the Abrikosov vortex lattice are ...

Structural and superconducting properties of amorphous MoSi (approx.55%Si) and MoGe (approx.30% Ge) films (200 and 50 nm in thickness) prepared by rf magnetron sputtering were examined for the purpose of application to Abrikosov vortex memory devices. Amorphous single-phase films were obtained at concentrations of 20% Si and above, while a crystalline phase was detected even ...

Since the early 1960s, Abrikosov-Gorkov theory has been used to describe superconductors with paramagnetic impurities. Interestingly, the density of states resulting from the theoretical framework has to date only been known approximately, as a numeric solution of a complex polynomial. An analytical solution to the theory was ...

By minimising the Gibbs free energy for samples of a planar geometry anistropic London theory is used to predict the Abrikosov flux lattice for arbitrary field orientations. The results of this calculation are in close agreement to the Bitter pattern experiments of Gammel et al. [1], assuming an anisotropy ratio ? = 5 and an inplane penetration depth ?ab = ...

In singlet s-wave superconductors magnetic impurities break the Cooper pairs and suppress superconductivity. In a mean field theory of such pairbreaking due to Abrikosov and Gor'kov, at low impurity concentration the quasiparticle gap is reduced but remains finite. Gapless superconductivity occurs only when the impurity concentration exceeds a critical ...

When subject to a weak magnetic impurity distribution, the order parameter and quasi-particle energy gap of a weakly disordered bulk s-wave superconductor are suppressed. In the Born scattering limit, recent investigations have shown that 'optimal fluctuations' of the random impurity potential can lead to the nucleation of 'domains' of localized states within the gap region predicted by the ...

Magnetization measurements have been made at 4.2�K on a variety of binary lead-base alloys, with the purpose of determining the effects of solutes, precipitates, and dislocations on superconducting properties. Increasing solute concentration results in increasingly broad magnetic transitions, the results correlating with normal-state electron mean free path in quantitative agreement with ...

Magnetization measurements have been made at 4.2 deg K on a variety of binary lead-base alloys, with the purpose of determining the effects of solutes, precipitates, and dislocations on superconducting properties. Increasing solute concentration results in increasingly broad magnetic transitions, the results correlating with normal-state electron mean free path in quantitative agreement ...

We have performed muon spin rotation (?SR) measurements in the radioactive Pu-based superconductor PuCoGa5 to study the effects of radiation damage on the superconducting properties. The same single crystals were studied 25 days (fresh) and 400 days (aged) after initial preparation. We find that the ?SR rate ?v, which is proportional to superfluid density ?s, is steeply reduced in the aged sample ...

Within the framework of the exact muffin-tin orbitals (EMTO) theory a new method to calculate the electronic structure and the total energy for random substitutional alloys has been recently developed [1]. The problem of disorder is treated within the coherent potential approximation (CPA), and the total energy is obtained using the full charge density (FCD) technique. The ...

It is shown that the Bragg glass phase can become unstable with respect to planar crystal defects as twin or grain boundaries. A single defect plane that is oriented parallel to the magnetic field as well as to one of the main axis of the Abrikosov flux line lattice is always relevant, whereas we argue that a plane with higher Miller index is irrelevant, even at large defect ...

We have introduced defects into clean samples of the organic superconductor ?-(BEDT-TTF)2Cu(SCN)2 in order to determine their effect on the temperature dependence of the interlayer conductivity ? and the critical temperature Tc. We find a violation of Matthiessen�s rule that can be explained by a model of ? involving a defect-assisted interlayer channel which acts in parallel with the bandlike ...

Quantum transport of Dirac cone states in the iron pnictide Ba(FeAs)(2) with a d-multiband system is studied by using single crystal samples. Transverse magnetoresistance develops linearly against the magnetic field at low temperatures. The transport phenomena are interpreted in terms of the zeroth Landau level by applying the theory predicted by ...

Quantum transport of Dirac cone states in the iron pnictide Ba(FeAs)2 with a d-multiband system is studied by using single crystal samples. Transverse magnetoresistance develops linearly against the magnetic field at low temperatures. The transport phenomena are interpreted in terms of the zeroth Landau level by applying the theory predicted by Abrikosov. ...

In superconductors penetrated by Abrikosov vortices, the magnetic pressure and the inhomogeneous condensate density induce a deformation of the ionic lattice. We calculate how this deformation corrugates the surface of a semi-infinite sample. The effect of the surface dipole is included.

Conference on Superconductivity (TICS '95), Hualien, Taiwan; Aug 8-11, 1995 (ANL/MSD/CP-91998) "Some Consequences of the Layered Structure of HTSC"; Abrikosov, A. A.;...

A solution is described of the Ginzburg-Landau equations of the Abrikosov type for a homogeneous type II superconductor just below the upper critical field. This solution is characterized by magnetic field maxima corresponding to an equilateral triangular lattice and a value BETA = 1.16 of Abrikosov's parameter. ...

I discuss two exotic objects that must be experimentally identified in chiral superfluids and superconductors. These are (i) the vortex with a fractional quantum number (N = 1/2 in chiral superfluids, and N = 1/2 and N = 1/4 in chiral superconductors), which plays the part of the Alice string in relativistic theories and (ii) the hedgehog in the;l field, which is the ...

I discuss two exotic objects that must be experimentally identified in chiral superfluids and superconductors. These are (i) the vortex with a fractional quantum number (N = 1/2 in chiral superfluids, and N = 1/2 and N = 1/4 in chiral superconductors), which plays the part of the Alice string in relativistic theories and (ii) the hedgehog in the ^l field, which is the ...

Systematic transport measurements have been performed on a series of superconducting nanowires in strong perpendicular and parallel magnetic fields (up to 11 T). The samples included nano-crystalline Nb wires and amorphous MoGe wires fabricated by deposition of a corresponding material over the surface of a suspended fluorinated carbon nanotube. We found that the ...

Transport entropy, Sd, defines both the thermal force, fth=?Sd?T, pushing a vortex along ??T in the Nernst effect and the thermal energy, epsilonth=SdT, transferred by a vortex in the Ettingshausen effect. All current theories associate the main contribution to Sd with the electromagnetic energy of superconducting currents circulating around cores, Fem(T). Using the universal ...

A set of linear equations for the vertex function associated with conduction-electron scattering from a spin-dependent impurity potential is derived from perturbation theory and is shown to lead to the Abrikosov vertex function in the limit of a contact interaction and logarithmic accuracy. The general reduction to quadratures of the linear equations is ...

Recent ab initio calculations of volume dependences of magnetic properties for the most typical Invar system, a random fcc Fe-Ni Invar alloy, have shown that the evolution of the magnetic structure already at zero temperature is characterized principally by a continuous transition from the high-spin ferromagnetic state at high volumes to a disordered noncollinear configuration at low volumes [1]. ...

The superconducting transition temperature of crystalline and amorphous cadmium doped with dilute Mn atoms was measured. In the first case the initial depression of T/sub c/ as function of concentration is dT/sub c//dc = 5.4 K/at percent and in the second case dT/sub c//dc = 2.65 K/at percent. Both systems show non linear behavior at higher concentrations, the one in the crystalline state much ...

We develop a stochastic Gross-Pitaveskii theory suitable for the study of Bose-Einstein condensation in a rotating dilute Bose gas. The theory is used to model the dynamical and equilibrium properties of a rapidly rotating Bose gas quenched through the critical point for condensation, as in the experiment of Haljan [Phys. Rev. Lett. 87, 210403 (2001)]. In ...

The structure of Abrikosov state (AS) in the type-II superconductors shares many properties of other physical systems, such as electron gases in the regime of the Quantum Hall Effect and the rotating atoms in magnetic traps. Usually, is described using Landau gauge for the magnetic field. We employ the symmetric gauge to reveal deep analogies between the ...

The shapes of the Abrikosov vortices and of the magnetic-field lines in [ital c]-oriented superconducting slabs or films in a tilted magnetic field [ital B][sub [ital a

A diagrammatic Green's-function method is developed for the calculation of the magnetization of a magnetic impurity in metal. The validity of the approach is within Abrikosov and Suhl's limit. Therefore, the result in this paper should be regarded as an i...

Direct magneto-optic observation of coupling of the Abrikosov vortices into macroscopic drops of increased flux density at remagnetization of the YBCO single crystal is presented. Appearance of these flux structures correspond to strong perturbations of t...

The upper critical fields of niobium-tin and vanadium-silicon were measured and analyzed within the Ginzburg-Landau-Abrikosov-Gor'kov theory of type 2 superconductivity. The importance of many-body effects on the spin states of the superconductor is stressed, especially the renormalization of the Pauli paramagnetic limiting process. For niobium-tin failure ...

The phase diagram of the superconducting transition temperature T/sub c/ and the magnetic ordering temperature T/sub M/ versus the composition x has been determined for the mixed ternary system (Sm/sub 1-x/Y/sub x/)Rh/sub 4/B/sub 4/. The x dependence of T/sub c/ is described well by the Abrikosov-Gor'kov theory modified to include the influence of ...

We review some analytical results of our studies of the charge- and spin density modulations (CDW and SDW) in a one- and two-dimensional electron systems. Self-consistent solutions of Bogoliubov- de Gennes equations for spin-charge solitonic superstructure and superconducting state are obtained in the framework of one and two-dimensional extended Hubbard models. Possible correspondence of the ...

Measurements of the specific heat jump DELTA c(T/sub c/) were performed on superconducting La/sub 1-x/Tb/sub x/Al/sub 2/ compounds in order to investiga te the pairbreaking effect of Tb/sup 3+/ ions in the LaAl/sub 2/ host. The results deviate from the Abrikosov-Gorkov theory for superconductors with magnetic impurities. Taking into account the ...

The regular solutions for the Ginzburg-Landau(-Nielsen-Olesen) Abelian gauge model are studied numerically. We consider the static isolated cylindrically symmetric configurations. The well-known (Abrikosov) vortices, which present a particular example of such solutions, play an important role in the theory of type-II superconductors and in the models of ...

Optimized sputtered YBa{sub 2}Cu{sub 3}O{sub 7} (YBCO) thin films on CeO{sub 2}-buffered sapphire substrates are patterned into square lattices of submicrometer holes (antidots) with diameters of 250{endash}450 nm and lattice parameters of d=500{endash}1000nm without deterioration of superconducting properties. In the mixed state, matching effects between the Abrikosov vortex ...

We report magnetic susceptibility, resistivity and heat capacity measurements on single crystals of Sr(Fe1-xCox)2As2 and Sr1-xEux(Fe0.88Co0.12)2As2 series. The optimal Co concentration for superconductivity in Sr(Fe1-xCox)2As2 is determined to be x=0.117. Based on this we grew members of the Sr1-yEuy series to examine the effects of well defined local moment scattering on the superconducting ...

In this article we present new, genuinely non-Abelian vortex solutions in SU(2) Yang-Mills-Higgs theory with only one isovector scalar field. These non-Abelian solutions branch off their Abelian counterparts (Abrikosov-Nielsen-Olesen vortices) for precise values of the Higgs potential coupling constant {lambda}. For all values of {lambda}, their energies ...

We report effects of local magnetic moment, Gd3+ , doping (x?0.3) on superconducting and magnetic properties of the closely related Lu1-xGdxNi2B2C and Y1-xGdxNi2B2C series. The superconducting transition temperature decreases and the heat capacity jump associated with it drops rapidly with Gd doping; qualitative changes with doping are also observed in the temperature-dependent upper ...

We report effects of local magnetic moment, Gd^3+, doping (x <=0.3) on superconducting and magnetic properties of the closely related Lu1-xGdxNi2B2C and Y1- xGdxNi2B2C series. The superconducting transition temperature decreases and the heat capacity jump associated with it drops rapidly with Gd-doping; qualitative changes with doping are also observed in the temperature-dependent upper ...

A series of single-phased Dy1-xTmxNi2B2C (x=0-1) compounds were prepared by an arc-melting method. The superconductivity and magnetic properties have been investigated by measuring electrical resistivity, magnetization, and specific heat. The superconducting transition temperature Tc decreases rapidly with increasing x , and shows a minimum around x=0.15 , then increases gradually with a ...

It is shown that within continuum theory and linear elasticity the interaction of point defects in two- and three-dimensional lattices with isotropic long-range interaction is ideally screened; i.e., the elastic relaxation of the background lattice exactly compensates the long-range interaction between the defects. A small residual short-range interaction results from the ...

Thermally activated hopping of a single Abrikosov vortex has been investigated for a thin Pb film that was decorated with an artificial pinning structure. To determine the location of the vortex, the Pb film is fabricated to be one electrode of a cross-strip superconductor/normal-metal/insulator/superconductor (SNIS[prime]) Josephson junction. Distortions in the Fraunhofer ...

Alex AbrikosovAbrikosov and Tony Leggett for discussions andand Tony Leggett for discussions and mentorshipPioneering Work SS--wave BCSwave BCS--BECBEC Leggett (1980) (First T = 0 analysis.)Leggett (1980) (First T = 0

The possibility of existence of stable closed Abrikosov vortices of small size in nonuniform type-II superconductors is shown. These compact magnetic structures localize in all three dimensions and interact weakly with the external magnetic environment. The closed vortex is stabilized near the cylindrical interface between two superconductors with different magnetic field ...

The mass shift induced by one-loop quantum fluctuations on self-dual Abrikosov-Nielsen-Olesen (ANO) vortices is computed using heat kernel/generalized zeta function regularization methods. The quantum masses of superimposed multivortices with vorticity lower than five are given. The case of two separate vortices with a quantum of magnetic flux is also discussed.

The paper considers the dependence of the effective elasticity of a niobium plate on the orientation of Abrikosov vortices relative to the direction in which the plate is bent. It is shown that if the vortices bend together with the sample relative to the magnetic field during oscillations, the elasticity of the plate in fields H=4 kOe increases by a factor of approximately ...

Procedures have been developed to determine the location of a single Abrikosov vortex in a Superconductor-Normal metal-Superconductor (SNS) Josephson junction and study its motion under the influence of a Lorentz force. A vortex in a SNS junction generate...

We study the stability properties of the twisted vortex solutions in the semilocal Abelian Higgs model with a global SU(2) invariance. This model can be viewed as the Weinberg Salam theory in the limit where the non-Abelian gauge field decouples, or as a two component Ginzburg Landau theory. The twisted vortices are characterized by a constant global ...

A nondestructive readout random access memory (RAM) cell based on the use of Abrikosov vortices in thin-film type-II superconductors is newly designed and experimentally tested. The cell occupies an area of 30 x 60 ..mu..m/sup 2/ with a 5-..mu..m design rule. Proper memory cell operation is achieved in the so-called 1, -1 mode using the shift saturation effect, which occurs on ...

Through low-field ac susceptibility measurements we have determined the depression of the superconducting transition temperature T/sub c/ in palladium hydride (T/sub c/0 = 9.3 K) as a function of impurity concentration x for Cr, Mn, and Fe. For Cr and Fe similar values for the initial T/sub c/ depression were found, i.e., -150 K/at. % Cr and -145 K/at. % Fe. From resistivity experiments we are ...

Measurements are presented of the far-infrared absorption of thin superconducting aluminum films in a parallel magnetic field. The results for moderately thick films (d-italicroughly-equal10 nm) are in reasonable agreement with the Abrikosov-Gor'kov theory of pair breaking. The experimental results for ultrathin films (d-italic< or =5 nm) in ...

An effective field theory approach is used to describe quantum matter at greater-than-atomic but less-than-nuclear densities which are encountered in white dwarf stars. We focus on the density and temperature regime for which charged spin-0 nuclei form an interacting charged Bose-Einstein condensate, while the neutralizing electrons form a degenerate fermi gas. After a brief ...

This thesis describes three projects that I have worked on last three years. These projects are concerned with the physical properties of fluctuating membranes with tangent-plane orientational order and proteins there-in. First, we consider in mean-field theory the continuous development below a second-order phase transition of n-atic tangent plane order on a deformable ...

The surface impedance of 1.0--1.5..mu.. Nb films were measured as a function of temperature and magnetic field. The results are compared with predictions of the Mattis-Bardeen model and Abrikosov--Gor'kov--Khalatnikov model.(AIP)

Direct magneto-optic observation of coupling of the Abrikosov vortices into macroscopic drops of increased flux density at remagnetization of the YBCO single crystal is presented. Appearance of these flux structures correspond to strong perturbations of the current trajectories and transition fro laminar to turbulent current flow.

Mar 1, 2011 ... These YBCO films are deposited on LaAlO3 and SrTiO3 substrates with the ... the peak corresponds to the melting point of the Abrikosov flux lattice. .... Surface resistance was measured for samples with surfaces oriented ...

It has been proposed that the Abrikosov flux lattice in high-{ital T}{sub {ital c}} superconductors is melted over a significant fraction of the phase diagram. We provide a thermodynamic argument which establishes that the angular dependence of the melting temperature is controlled by the superconducting mass anisotropy. Using a low-frequency torsional-oscillator technique, ...

Data obtained by mechanically vibrating a superconductor sample in a magnetic field indicate that the Abrikosov fluxoids penetrate the sample in jumps. The number of vortices entering the sample in each jump is so high that even if they were distributed over the entire sample surface prior to penetration they would fill several surface layers with total thickness on the order ...

Superconductivity in the 90-K range is observed in most of the orthorhombic {ital R}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} compounds ({ital R} being rare-earth elements and Y). However, the isostructural Pr compound is not superconducting, either due to the 4+ state of Pr whereby the extra electron from Pr fills the Cu-O band, or due to the hybridization of the Pr 4{ital f} states with the O ...

The spin superfluidity -- superfluidity in the magnetic subsystem of a condensed matter -- is manifested as the spontaneous phase-coherent precession of spins first discovered in 1984 in ^3He-B. This superfluid current of spins -- spin supercurrent -- is one more representative of superfluid currents known or discussed in other systems, such as the superfluid current of mass and atoms in ...

Magnetization studies have been made of single-crystal La{sub 1.90}Sr{sub 0.10}CuO{sub 4} with H{parallel}c in order to determine the magnitude of the flux expulsion and free energy in a material that has substantially less than optimal doping. Well above the superconducting transition temperature, the normal-state magnetization exhibits a two-dimensional Heisenberg antiferromagnetic behavior. ...

I. The upper critical fields of niobium-tin and vanadium-silicon were measured and analyzed within the Ginzburg-Landau-Abrikosov-Gor'kov theory of type II superconductivity. The importance of many-body effects on the spin states of the superconductor is stressed, especially the renormalization of the Pauli paramagnetic limiting process. For ...

The superconducting transition and the magnetic structure of polycrystalline (Ho{ital {sub x}}Y{ital {sub 1{minus}x}})Ni{sub 2}B{sub 2}C have been investigated for {ital x}{ge}0.75 by resistivity measurements and neutron diffraction, respectively. For HoNi{sub 2}B{sub 2}C, the well known antiferromagnetic structure with {ital c}- and {ital a}-axis components existing between 4.5 and 6 K has been ...

Temperature-dependent resistivity and magnetic susceptibility were studied for quaternary borocarbide intermetallic compounds Y1-xHoxNi2B2C (x = 0, 0.25, 0.5, 0.75), which show coexistence of superconductivity with magnetism. In a normal state, the compounds exhibit conventional metallic behaviour. The Debye temperature ?D is derived by fitting the temperature dependence of resistivity to the ...

Many superconducting systems of interest, including high-Tc ones, are of an extreme type-II character: the slope of the upper critical field at T_c0 is of the order of 1 Tesla/Kelvin. In such systems there is an appreciable high-magnetic-field, low-temperature region in the HT-phase diagram where the Landau level structure plays an important role in the superconducting state. I will review recent ...

The flux-line lattice in type-II superconductors has unusual nonlocal elastic properties which make it soft for short wavelengths of distortion. This softening is particularly pronounced in the highly anisotropic high-T[sub c] superconductors (HTSC) where it leads to large thermal fluctuations and to thermally activated depinning of the Abrikosov vortices. Numerous transitions ...

Measurements of the attenuation of an axial magnetic field by cylindrical, thin, superconducting films were made by using a SQUID-based magnetometer. The sample films were between 40 and 85 A thick. They were composed of indium and of indium containing a small amount of gadolinium. Each film was made by flash-evaporating pellets and quench-condensing the film onto a substrate. The sector of the ...

Measurements of the attenuation of an axial magnetic field by cylindrical, thin, superconducting films were made by using a SQUID-based magnetometer. The sample films were between 40 and 85 A thick. They were composed of indium and of indium containing a small amount of gadolinium. Each film was made by flash-evaporating pellets and quench-condensing the film onto a substrate. The sector of the ...

An extensive study of magnetic, electrical transport, and structural properties of the normal and superconducting states of Gd{sub 1{minus}x}Pr{sub x}Ba{sub 2}Cu{sub 3}O{sub 7{minus}y} (GdPr-123) are presented. Ceramic compounds have been synthesized by the solid-state reaction technique, and characterized by x-ray-diffraction, scanning-electron-microscopy, thermogravimetric, and ...

We measure nuclear magnetic resonance (NMR) spectra for various dopings of Bi2Sr2CaCu2O8+y to determine the variations of local magnetic fields generated by the vortex lattice at low temperatures. With increasing the external magnetic field H0, the local field variations decrease to values lower than expected by Ginzburg-Landau calculations for an Abrikosov vortex lattice. ...

The superconducting transition temperature of more than 30 thin-film tungsten samples was measured using a dilution refrigerator. The samples were fabricated using a 99.999% pure tungsten target and a dc magnetron sputtering system. Individual films were then doped with metal impurity ions using an accurate ion implantation technique. The effect of the metal-ion doping on the superconducting ...

The gap equation for anisotropic superconductivity is solved in the presence of elastic scatterings by nonmagnetic and magnetic impurities, which are treated by the self-consistent Born approximation, and inelastic scatterings, which are phenomenologically treated. When elastic scatterings are strong, even at T=0 K, coherence peaks almost disappear and the gap is a pseudogap, i.e., the density of ...

We have measured the temperature dependence and magnitude of the superfluid density ?s(T) via the magnetic field penetration depth ?(T) in PuCoGa5 (nominal critical temperature Tc0=18.5K ) using the muon spin rotation technique in order to investigate the symmetry of the order parameter, and to study the effects of aging on the superconducting properties of a radioactive material. The same ...

A theory of critical fluctuations in extreme type-II superconductors subjected to a finite but weak external magnetic field is presented. It is shown that the standard Ginzburg-Landau representation of this problem can be recast, with help of a mapping, as a theory of a new ``superconductor,'' in an effective magnetic field whose overall value is zero, ...

A focused study on the effect of transition-metal substitution for Fe in the compounds Lu/sub 2/(Fe/sub 1-x/T/sub x/)/sub 3/Si/sub 5/ (where T = Cr, Mn, Co, Ni Cu, and Ru) is reported. The effect of these transition metals on the superconducting transition temperature shows that Cr, Co, Ni, and Ru all act as non-magnetic impurities. By fitting the experimental data T/sub c//T/sub co/ to ...

A study on the effect of transition metal substitution for Fe in the compounds Lu/sub 2/(Fe/sub 1-x/T/xub x/)/sub 3/Si/sub 5/ (T=Cr, Mn, Co, Ni, Cu, and Ru) is reported. The effect of these transition metals on the superconducting transition temperature shows that Cr, Co, Ni and Ru all act as nonmagnetic impurities. Good agreement with Kaiser's theory is obtained. ...

A new family of superconductor--normal-metal--insulator--superconductor ({ital S}/{ital I}/{ital N}/{ital S}) Josephson junctions have been developed in which a single Abrikosov vortex can be nucleated and systematically moved to selected positions. The location of the vortex within the junction is determined from the shape of the diffraction patterns. Methods have been ...

Critical current and flux pinning were examined for ion-beam sputtered (IBS)= amorphous beryllium (a-Be) thin films with T/sub c/ 6 K. Pinning forces in IBS a-Be films were one or more than one order of magnitude smaller than those for crystalline superconductors, but were still rather large for amorphous superconductors. The viscosity coefficient for IBS a-Be was very small, 1--2 x 10/sup -9/ N ...

Exploiting the peculiar properties of proximity-induced superconductivity on the surface of a topological insulator, we propose a device, which allows the creation of a Majorana fermion inside the core of a pinned Abrikosov vortex. The relevant Bogolyubov-de Gennes equations are studied analytically. We demonstrate that in this system the zero-energy Majorana-fermion state is ...

In this paper we discuss how Abrikosov-Nielsen-Olesen vortices can act as impurities that seed first-order phase transitions. The seeding mechanism comes about through dissociation of what is normally considered to be topologically stable defects. We discuss the conditions necessary for dissociation in which the core, which contains the seed of stable phase, becomes unstable ...

We describe the decomposition of Abrikosov vortices into decoupled pancake vortices in superconductors having both electron and hole charge carriers. We estimate the critical current of such a decomposition, at which a superconducting-normal state transition occurs, and find that it is very sensitive to the magnetic field and temperature. The effect can be observed in recently ...

The statistical mechanics of the flux-line lattice in extreme type-II superconductors is studied within the framework of the uniformly frustrated anisotropic three-dimensional XY model. It is assumed that the externally applied magnetic field is low enough to invalidate the lowest Landau-level approach to the problem. A finite-field counterpart of an Onsager vortex-loop transition in extreme ...

Both artificial and native rare earth (RE) tunnel barriers have been successfully fabricated. Artificial barriers are of the form M-REOx-M (M = Al, Pb, PbBi; RE = Ho, Dy, Gd, Lu), and native barriers are of the form RE-REOx-s (S = Pb, PbBi; RE = Dy, Ho). Artificial barriers are formed by oxidizing a thin (5-20 {angstrom}) film of evaporated RE. Current-Voltage characteristics (I-V) produced by ...

on the existence of `crossing' pancake vortex (PV) and Josephson vortex (JV) lattices in Bi2Sr2CaCu2O8+d (BSCCO. In this example the binary mixture is comprised of weakly coupled Josephson and pancake vortices viewed as stacks of 2D pancake vortices (PVs) which interact to form well-ordered hexagonal Abrikosov

We have discovered and applied an analytical solution of the Abrikosov-Gorkov ^1 density of states (DOS), describing superconductors with impurities, to extract the spin-polarization of 3-dimensional amorphous (a-) GdxSi1-x in the quantum critical regime (QCR) of a magnetic field tunable metal-insulator transition (MIT). The analysis of the experimental spin-polarized (SP) ...

We have calculated the upper critical magnetic field in a simple-model spin-glass superconductor. We find temperature variations that can deviate significantly from Abrikosov-Gor'kov predictions and that strongly reflect the relatively modest underlying temperature dependence of the effective magnetic scattering.

The stability of the Abrikosov flux-line lattice for uniaxially anisotropic superconductors has been studied in the London approximation as a function of the anisotropic mass ratio and the angle [theta] between the [ital B] field and crystal [ital c] axis. For anisotropic mass ratio [ital M][sub [ital c

Current-voltage characteristics were measured for bridges of superconductors having A15 lattices at low voltages; it was found that the characteristics are then exponential, the exponential range being proportional to the resistivity of the films. The existence of thermally activated flux creep in such contacts was demonstrated by experiment. The temperature dependence of the critical bridge ...

The transfer mechanism of holes in the 123 compounds between chains and layers by optical transverse boson mode is introduced. The critical temperature as a function of the magnetic impurity concentrations both in the planes and in the chains is obtained. The critical temperature is determined by the difference of the concentrations in the chains and in the planes. The dependence strongly differs ...

We calculate the structure of individual vortices in rotating Bose-Einstein condensates in a transverse harmonic trap. Making a Wigner-Seitz approximation for the unit cell of the vortex lattice, we derive the Gross-Pitaevskii equation for the condensate wave function in each cell of the lattice, including effects of varying coarse grained density. We calculate the Abrikosov ...

We investigate the appearance of vortices and vortex lattices in two-dimensional, anisotropic, and rotating Bose-Einstein condensates. Once the anisotropy reaches a critical value, the positions of the vortex cores in the ground state are no longer given by an Abrikosov lattice geometry but by a linear arrangement. Using a variational approach, we determine the critical ...

A nondestructive readout (NDRO) random access memory based on the use of a two-dimensional array of strong pinning sites in a film in the mixed state is proposed. Information is stored as the off-center displacement of vortices in overlay films. The overlay films are electrodes of a Josephson junction, which detects the position of the vortex by means of the critical current suppression.

A microscopic calculation of vortex-lattice states in two-dimensional electron systems at strong magnetic fields is made taking fully the Landau level quantization into account within the mean field scheme. Results of the order parameter and the local density of states are presented both in the limit of pairing in a single Landau level and in the semiclassical regime of weaker fields and ...

Morrison' at CERN notes regional variation in fusion cell results and various workers have ascribed this to possible sociological factors. In view of the observation by other workers of gamma and neutrons from electric storms, the present paper seeks physical causes of such variation in terms of meteorological conditions. Previous work on Abrikosov vortices (rotating strings ...

The high atomic number of some superconducting elements such as niobium (Z=41) and tantalum (Z=73) and a high material thickness (e.g., t=300 mum) are emphasized as essential properties for development of a gamma-ray solid state detector with high intrinsic detection efficiency in the energy range up to 100 keV. To exploit these properties, a new detection principle based on the interaction of a ...

The high atomic number of some superconducting elements such as niobium (Z=41) and tantalum (Z=73) and a high material thickness (e.g., t=300 ?m) are emphasized as essential properties for development of a gamma-ray solid state detector with high intrinsic detection efficiency in the energy range up to 100 keV. To exploit these properties, a new detection principle based on the interaction of a ...

The formation of an Abrikosov flux vortex with its core axis perpendicular to an anisotropic (a-c or b-c) plane in YBa2Cu3O7 requires only 1/10 of the energy required by the formation of a vortex with its core axis perpendicular to an isotropic (a-b) plan...

In layered superconductors with very weak coupling between the layers the concept of a flux-line lattice breaks down when the field is oriented parallel to the superconducting planes. For an arbitrary field orientation we propose that the formation of an Abrikosov lattice is only related to the perpendicular field component. The parallel field component penetrates as if the ...

A systematic study of the superconducting and normal state properties of LaBaCaCu_3O _{7-delta}, Y_{1-x}Pr_{x} Ba_2 Cu_3 O_{7-delta} and rm Nd_{2-x}Ce _{x} CuO_{4-delta} is reported in this work. X-ray powder diffraction, thermogravimetric analysis, dc electrical resistivity, and dc magnetic susceptibility measurements were used to characterize these samples. The compound LaBaCaCu _3O_{7-delta} ...

Magnetic hysteresis and flux creep measurements in single crystal samples of YBa2Cu3O7?? (YBCO) are presented for a wide range of B , T phase space. Some of these samples can be described as weakly or collectively pinned. For these, over a large portion of this phase space, the flux creep can be described in terms of thermally activated single-fluxoid motion. A simple model based on maximizing ...

We present a survey of results obtained with Etienne Sandier on vortices in the minimizers of the 2D Ginzburg-Landau energy of superconductivity with an applied magnetic field, in the asymptotic regime of large kappa where vortices become point-like. We describe results which characterize the critical values of the applied field for which vortices appear, their numbers and locations. If the ...

The suppression of the critical temperature due to isotropic impurity scattering in a d-wave superconductor is expected to be described by the Abrikosov-Gor'kov formula. However recent experiments on cuprate superconductors with out-of-plane defects show a nearly linear decrease of the critical temperature as a function of the residual resistivity in contradiction to the ...

We report on the magnetic field (H) dependence of the form factor |F|^2 of the vortex lattice (VL) in CeCoIn5 obtained by small angle neutron scattering for H applied along the crystallographic c-axis. Superconductivity (SC) in CeCoIn5 has several unconventional aspects to it: The d-wave SC is in competition with antiferromagnetic order, as suggested by the presence of an magnetic QCP located at ...

Artificial structures were intentionally introduced into Nb films in order to study the interaction of a single Abrikosov vortex with pinning sites caused by these known defects. A vortex trapped on one of these structures or defects can be induced to move either by thermal depinning or by pushing on the vortex with a transport current in one of the films. The resulting ...

A maximum-entropy method has been applied to transverse-field muon-spin-rotation vortex data of [ital R]Ba[sub 2]Cu[sub 3]O[sub 7] ([ital R] 1:2:3:7; [ital R]=Er, Gd, and Eu); this produces spectra representing estimates for the magnetic-field distributions. The information on the field distribution is of better quality than that resulting from Fourier transformation and curve fitting of the same ...

It has been well established that the critical current density J{sub c} across grain boundaries (GBs) in high-temperature superconductors decreases exponentially with misorientation angle {theta} beyond {approx}2-3 degrees. This rapid decrease is due to a suppression of the superconducting order parameter at the grain boundary, giving rise to weakly pinned Abrikosov-Josephson ...

It is used the mechanical method of Abrikosov vortex stimulated dynamics investigation in superconductors. With its help it was studied relaxation phenomena in vortex matter of high-temperature superconductors. It established that pulsed magnetic fields change the course of relaxation processes taking place in vortex matter. The study of the influence of magnetic pulses ...

This paper presents the results of a comprehensive study of the relationship of the structural and electrodynamic characteristics of quasi-single-crystal films of the HTSC cuprate YBa2Cu3O7-? (YBCO) with various concentrations (several mass percent) of nanosize inclusions of the perovskitelike phase of BaZrO3 (BZO). High-resolution electron microscopy is used to investigate the nanostructure of ...

The dependence of the percolative critical current density at low magnetic fields on YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} (YBCO) layer thickness is studied by comparing grain, J{sub c}{sup G}, and grain-boundary, J{sub c}{sup GB}, critical current densities for a series of ex situ processed YBCO films on a RABiTS template. Both critical current densities decrease as a function of thickness and the ...

We study the phase diagram of the flux lines using the mapping to two-dimensional bosons interacting via the Yukawa potential in the hypernetted-chain approximation. The pair-correlation function, static structure factor, and spectrum of the excited energies are calculated over a wide range of the parameter. These quantities are used for studying the freezing transition from the entangled vortex ...

The first use of high temperature superconducting films is discussed as an information recording medium in a format that could be modified for use in a large disc dive system. The system uses Abrikosov vortices to store integer units, [phi][sub 0], of magnetic flux in a hysteresis loop. A proof of principle system has been assembled using a 0.3-[mu]m film of YBCO on LaAlO[sub ...

behaviour" J. Chem. Phys. 122, 014112 (2005). J.R. TRAIL and R.J. NEEDS "Smooth relativistic Hartree-principles calculation of the 0-17 NMR parameters of a calcium aluminosilicte glass" J. Phys. Chem. B 109, 6052.A. CARTER "Ultrasoft spin-dependent pseudopotentials" J. Chem. Phys. 123, 214101 (2005). N.R. COOPER, E

We have studied numerically the classical states of equilibrium, stable and metastable, of magnetic-field vortex lines in a type-II superconductor in the presence of twin boundaries which attract the vortex lines. Depending on the value of the magnetic field and the density of the twin boundaries, a variety of situations is found. Among them are Abrikosov lattices, anisotropic ...

The peak effect PE is considered to signal the collapse of shear modulus of a weakly pinned flux line lattice. The observed reentrant behavior in PE curves (for H ?c,?a) of very clean single crystals of anisotropic super-conductor 2H-NbSe2 (Tc=7.1 K) resembles the predicted reentrant melting curve for pure Abrikosov lattice. The disappearance of PE phenomenon at low fields ...

A radiation detector is provided, wherein a bulk high T superconducting sample is placed in a magnetic field and maintained at a superconducting temperature. Photons of incident radiation will cause localized heating in superconducting loops of the sample destroying trapped flux and redistributing the fluxons, and reducing the critical current of the loops. Subsequent cooling of the sample in the ...

A radiation detector is provided, wherein a bulk high T[sub c] superconducting sample is placed in a magnetic field and maintained at a superconducting temperature. Photons of incident radiation will cause localized heating in superconducting loops of the sample destroying trapped flux and redistributing the fluxons, and reducing the critical current of the loops. Subsequent cooling of the sample ...

We demonstrate some unusual features of superconductivity in high magnetic fields by analytically diagonalizing the microscopic Bogoliubov--de Gennes Hamiltonian in the presence of a quantizing magnetic field and in the limit of pairing occurring within a sngle Landau level. Pairing is shown to occur between states of opposite reduced momenta, with periodicity established by the magnetic field. ...

Orientational order in weakly pinned Abrikosov flux lattices is studied, taking into account two heretofore neglected effects: dislocations and orientational couplings to the underlying lattice. Without orientational couplings, arbitrarily weak pinning destroys long-ranged orientational order for all spatial dimensions {ital d}{lt}4. Orientational couplings stabilize ...

. La surface S des boucles est de 25 x12 ~Lm~ (inductance L = 25 pH), le courant critique mesurd de 60~, est offerte par la commande en champ magndtique du courant critique d'un ou plusieurs microponts en vortex Abrikosov. 1.I PRINCIPE DE FONCTIONNEMENT. L'explication de la Variation dU CoUrant Critique du

Experiments on the irradiation-induced suppression of the critical temperature in high-Tc superconductors are analyzed within the mean-field Abrikosov-Gor'kov-like approach. It is shown that the experimental data for YBa2Cu3O7 single crystals can be quantitatively explained by the pair breaking effects under the assumption of the combined effect of potential and spin-flip ...

The properties of Nb/sub 3/Sn bridge junctions produced by double scribing are investigated. The current-voltage characteristics and the temperature dependence of the critical current of such film bridges are measured, and current steps are obtained in centimeter and decimeter microwave fields. A model is proposed to describe the steplike character of the current-voltage characteristics of bridges ...

The impurity effects on the transition temperature Tc and the isotope effect are examined in multiband superconductors with magnetic and nonmagnetic impurities, where the effect of Coulomb repulsion is considered. It is shown that an internal transition of the superconducting state is induced by impurity doping, and that the transition is accompanied by a jump of the isotope-effect coefficient ?. ...

The operation of superconducting coplanar waveguide cavities, as used for circuit quantum electrodynamics and kinetic inductance detectors, in perpendicular magnetic fields normally leads to a reduction in the device performance due to energy dissipating Abrikosov vortices. We experimentally investigate the vortex induced energy losses in such Nb resonators with different ...

We report self-consistent calculations of the microscopic electronic structure of the so-called giant vortex states. These multiquantum vortex states, detected by recent magnetization measurements on submicron disks, are qualitatively different from the Abrikosov vortices in the bulk. We find that, in addition to multiple branches of bound states in the core region, the local ...

The electromagnetic response of a pinned Abrikosov fluxoid is examined in the framework of the Bogoliubov--de Gennes formalism. The matrix elements and the section rules for both the single photon (emission-absorption) and two photon (Raman scattering) processes are obtained. The results reveal striking asymmetries: light absorption by quasiparticle pair creation or single ...

We microscopically derive the Ginzburg-Landau free-energy functional for a noncentrosymmetric superconductor with a large spin-orbit splitting of the electron bands, in the presence of nonmagnetic impurities. The critical temperature is found to be suppressed by disorder, both for conventional and unconventional pairings, in the latter case according to the universal ...

A model of a damped dc-driven long Josephson junction (LJJ) with periodically installed microresistors or microshorts (microshunts), or crossed by a periodic chain of Abrikosov vortices, is considered. A maximum value of the bias current density admitting pinned states of a fluxon and a minimum value admitting free motion of fluxon are found, the latter being an important ...

The suppression of the superconducting transition temperature of both the d-wave superconductor with nonmagnetic impurities and the s-wave one with magnetic impurities are described by the Abrikosov-Gor'kov formula. Unfortunately, this leads to a lot of confusion in high Tc super-conductor community. We compute here a few physical quantities of these 2 systems, which can ...

The intervortex interaction is investigated in very anisotropic layered superconductors in tilted magnetic field. In such a case, the crossing lattice of Abrikosov vortices (AVs) and Josephson vortices (JVs) appears. The interaction between pancake vortices, forming the AVs and JVs, produces the deformation of the AV line. It is demonstrated that, as a result of this ...

We demonstrate novel magneto-transport properties of magnetically coupled superconductor-ferromagnet (MoGe/Permalloy) bilayers. Ferromagnetic Permalloy film exhibiting stripe domains with rotatable anisotropy induces modulation of the order parameter in the superconducting thin film. Domain-wall superconductivity is localized above the magnetic domain walls forming mesoscopic superfluid channels. ...

The increased flux expulsion as T->Tc (observed as the external magnetic field, Bz = +/- 0.75 oe. goes through zero [1]) is related to the increased transmission as T->Tc (observed in all cuprate superconductors in the EXFAS region of X-ray absorption [2]). The expulsion of Abrikosov vortices as T->Tc is a cooperative dynamic phenomenon that affects only the EXAFS ...