Critical Behavior of the Flux-line Tension in Extreme Type-II Superconductors

Details Critical Behavior of the Flux-line Tension in Extreme Type-II Superconductors Critical Behavior of the Flux-line Tension in Extreme Type-II Superconductors

1996-04-24

arxiv.org/abs/cond-mat/9604152v1

Physics

Condensed Matter

12 pages of plain TeX, 2 postscipt figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.54.497

The entropic corrections to the flux-line energy of extreme type-II superconductors are computed using a schematic dual Villain model description of the flux quanta. We find that the temperature profile of the lower-critical field vanishes polynomially at the transition with an exponent $\nu\cong 2/3$ in the isotropic case, while it exhibits an inflection point for the case of weakly coupled layers in parallel magnetic field. It is argued that vestiges of these effects have already been observed in high-temperature superconductors.

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