Thermodynamics of the Superconducting Phase Transition in Ba0.6K0.4BiO3
P. Kumar, Donavan Hall, R. G. Goodrich
DOI 10.1103/PhysRevLett.82.4532 · Physical Review Letters
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Abstract
We suggest that the transition to superconductivity in a single crystal of Ba0.6K0.4BiO3 with Tc=32K, and having critical fields with anomalous temperature dependencies and vanishing discontinuities in specific heat and magnetic susceptibility, may well be an example of a fourth order (in Ehrenfest's sense) phase transition. We have derived a free energy functional for a fourth order transition and calculated (for the temperature range Tc/2<T≃Tc) the temperature dependence of the critical fields. We find Hc1(T)∝(1−T/Tc)3, H0(T)∝(1−T/Tc)2, and Hc2(T)∝(1−T/Tc)1 in general agreement with experiments.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba0.6K0.4BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
| Ba0.6K0.4BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
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