First-Order Transition and Critical End-Point in Vortex Liquids in Layered Superconductors

Details First-Order Transition and Critical End-Point in Vortex Liquids in Layered Superconductors First-Order Transition and Critical End-Point in Vortex Liquids in Layered Superconductors

2000-12-22

arxiv.org/abs/cond-mat/0012421v1

Physics

Condensed Matter

Superconductivity

9 pages, 5 figures

Scientific paper

10.1103/PhysRevB.64.024514

We calculate various thermodynamic quantities of vortex liquids in a layered superconductor by using the nonperturbative parquet approximation method, which was previously used to study the effect of thermal fluctuations in two-dimensional vortex systems. We find there is a first-order transition between two vortex liquid phases which differ in the magnitude of their correlation lengths. As the coupling between the layers increases,the first-order transition line ends at a critical point. We discuss the possible relation between this critical end-point and the disappearance of the first-order transition which is observed in experiments on high temperature superconductors at low magnetic fields.

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