Electric field effect on excess conductivity in high-Tc superconductors

Lysenko, V. S.; Gomeniuk, Y. V.; Lozovski, V.; Tyagulski, I.P.; Varyukhin, V. N.

doi:10.1016/0921-4534(94)92536-4

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…reviewed by Clem (1981b). Another such topical problem is the enhancement of pinning by an applied electric field (Mannhardt et al 1991, Mannhardt 1992, Jenks and Testardi 1993, Lysenko et al 1994, Frey et al 1995, Ghinovker et al 1995. Also omitted from this review were the rich properties of magnetic superconductors (Krey 1972(Krey , 1973, which may contain self-induced and spiral flux lines, see the reviews by Tachiki (1982) and Fulde and Keller (1982), of heavy-fermion superconductors like UPt 3 (Kleiman et al 1992), and of possible "exotic" superconductors with more-component order-parameter or with d-wave (or "s+id"-wave) pairing; see, e.g., Abrikosov (1995).…”

Section: Discussionmentioning

confidence: 99%

The flux-line lattice in superconductors

1995

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Magnetic flux can penetrate a type-II superconductor in form of Abrikosov vortices (also called flux lines, flux tubes, or fluxons) each carrying a quantum of magnetic flux φ 0 = h/2e. These tiny vortices of supercurrent tend to arrange in a triangular flux-line lattice (FLL) which is more or less perturbed by material inhomogeneities that pin the flux lines, and in high-T c superconductors (HTSC's) also by thermal fluctuations. Many properties of the FLL are well described by the phenomenological Ginzburg-Landau theory or by the electromagnetic London theory, which treats the vortex core as a singularity. In Nb alloys and HTSC's the FLL is very soft mainly because of the large magnetic penetration depth λ: The shear modulus of the FLL is c 66 ∼ 1/λ 2 , and the tilt modulus c 44 (k) ∼ (1 + k 2 λ 2 ) −1 is dispersive and becomes very small for short distortion wavelength 2π/k ≪ λ. This softness is enhanced further by the pronounced anisotropy and layered structure of HTSC's, which strongly increases the penetration depth for currents along the c-axis of these (nearly uniaxial) crystals and may even cause a decoupling of two-dimensional vortex lattices in the Cu-O layers. Thermal fluctuations and softening may "melt" the FLL and cause thermally activated depinning of the flux lines or of the two-dimensional "pancake vortices" in the layers. Various phase transitions are predicted for the FLL in layered HTSC's. Although large pinning forces and high critical currents have been achieved, the small depinning energy so far prevents the application of HTSC's as conductors at high temperatures except in cases when the applied current and the surrounding magnetic field are small.

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Section: Discussionmentioning

confidence: 99%

The flux-line lattice in superconductors

1995

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“…Recent experiments have shown that both the critical temperature of superconducting transition Tc and the critical current density Jc of high-T, superconducting thin films can be modulated by an electrostatic field applied to the sample surface [I-31. The negative electrostatic field applied to the surface of high-Tc samples was found to change the upper critical magnetic field Hc2 [4] and fluctuation enhanced excess conductivity above Tc [5,6].…”

Section: Introductionmentioning

confidence: 96%

Thermally Activated Dissipation and Upper Critical Magnetic Field under the Strong Electrostatic Field in the BiPbSrCaCuO Thin Film

et al. 1996

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Three different regimes of thermally activated dissipation behaviour were determined in the superconducting (Bi,Pb)2Sr2Ca2Cu30x thin film in dependence on the external magnetic field. Tile negative electrostatic field applied to the film surface has been found to increase the activatioil energy of flux creep in relatively low magnetic fields. The upper critical magnetic field determined from resistive nleasureinents increases in the vicinity of supercoilducting transition temperature under the influence of the electrostatic field.

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