Theory of a Higher Order Phase Transition: Superconducting Transition in BKBO

Details Theory of a Higher Order Phase Transition: Superconducting Transition in BKBO Theory of a Higher Order Phase Transition: Superconducting Transition in BKBO

2002-07-15

arxiv.org/abs/cond-mat/0207373v3

Phys. Rev. B68, 064505 (2003)

Physics

Condensed Matter

Superconductivity

18 pages, no figures

Scientific paper

10.1103/PhysRevB.68.064505

We describe here the properties expected of a higher (with emphasis on the order fourth) order phase transition. The order is identified in the sense first noted by Ehrenfest, namely in terms of the temperature dependence of the ordered state free energy near the phase boundary. We have derived an equation for the phase boundary in terms of the discontinuities in thermodynamic observables, developed a Ginzburg-Landau free energy and studied the thermodynamic and magnetic properties. We also discuss the current status of experiments on $Ba_{0.6}K_{0.4}BiO_3$ and other $BiO_3$ based superconductors, the expectations for parameters and examine alternative explanations of the experimental results.

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