Two-phase region of vortex-solid melting: 3D XY theory
Department of Physics, Purdue University - West Lafayette,
IN 47907-1396, USA
Accepted: 13 May 1998
In clean enough samples of the high-Tc oxide materials, the phase transition into the superconducting state occurs along a first-order line in the H-T plane. This means that a two-phase region occurs in the B-T plane, in which the liquid and solid vortex phases coexist. We discuss the thermodynamics of this two-phase region, developing formulae relating experimental quantities of interest. We then apply the 3D XY scaling theory to the problem, obtaining detailed predictions for the boundaries of the coexistence region. By using published data, we are able to predict the width of the two-phase region, and determine the physical parameters involved in the 3D XY description.
PACS: 74.25.Dw – Superconductivity phase diagrams / 64.60.Fr – Equilibrium properties near critical points, critical exponents
© EDP Sciences, 1998