Anisotropic Vortices in High-Temperature Superconductors and the Onset of Vortex-like Excitations above the Critical Temperature

Details Anisotropic Vortices in High-Temperature Superconductors and the Onset of Vortex-like Excitations above the Critical Temperature Anisotropic Vortices in High-Temperature Superconductors and the Onset of Vortex-like Excitations above the Critical Temperature

2005-04-28

arxiv.org/abs/cond-mat/0504767v1

Physics

Condensed Matter

Superconductivity

LaTeX, high temperature superconductivity, anisotropic vortices, onset of vortex-like excitations

Scientific paper

Recently we have found that a three-dimensional superconducting state with anisotropic vortices localized at the vortex-lattice points is a stable state in zero external magnetic field for the layered high temperature uperconductivity materials. There exists a phase transition at the temperature $T_{c}^{v}$ from the normal phase to the vortex superconducting state which is of the first order. The first order phase transition shows overheating and overcooling effects. Nucleation of the superconducting phase in the normal phase thus may occur at temperatures higher than the transition temperature $T_{c}^{v}$. Then the onset of the vortex-like excitations above the transition temperature $T_{c}^{v}$ occurs in our theory. The onset of the vortex-like excitations in Nerst signal and some other experimental evidence for these excitations above the transition temperature $T_{c}^{v}$ in LSCO, YBCO and in other high-temperature materials may be explained thus by our theory. The vortex-like excitations above and below the transition temperature $T_{c}^{v}$ in high temperature materials continuously evolve. This fact may be explained within our theory.

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