Theory of the vortex matter transformations in high Tc superconductor YBCO

Details Theory of the vortex matter transformations in high Tc superconductor YBCO Theory of the vortex matter transformations in high Tc superconductor YBCO

2002-05-28

arxiv.org/abs/cond-mat/0205580v2

Phys. Rev. Lett. 90, 167004 (2003)

Physics

Condensed Matter

Superconductivity

4 pages 3 figures

Scientific paper

10.1103/PhysRevLett.90.167004

Flux line lattice in type II superconductors undergoes a transition into a "disordered" phase like vortex liquid or vortex glass, due to thermal fluctuations and random quenched disorder. We quantitatively describe the competition between the thermal fluctuations and the disorder using the Ginzburg -- Landau approach. The following T-H phase diagram of YBCO emerges. There are just two distinct thermodynamical phases, the homogeneous and the crystalline one, separated by a single first order transitions line. The line however makes a wiggle near the experimentally claimed critical point at 12T. The "critical point" is reinterpreted as a (noncritical) Kauzmann point in which the latent heat vanishes and the line is parallel to the T axis. The magnetization, the entropy and the specific heat discontinuities at melting compare well with experiments.

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