Correlation-Induced Reentry in Impure Superconductors

D. Belitz

doi:10.1103/PhysRevLett.56.1175

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Correlation-Induced Reentry in Impure Superconductors

D. Belitz

DOI 10.1103/PhysRevLett.56.1175 · Physical Review Letters

T1

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Abstract

The interplay between disorder and effective electron-electron interaction in impure superconductors is studied within a BCS-Bogliubov model. It is shown to yield a square-root anomaly in the temperature dependence of Hc2 at the critical point. The resulting reentrant phase diagram is qualitatively discussed for Nb3Ge and for granular aluminum. Though the effect is of order TcEF, it should be easily visible in Nb3Ge or other A 15's, while for Al a precision experiment would be necessary.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb3Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	21	Pressure not reported	unknown
Nb3Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11	Pressure not reported	unknown
Nb3Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4	Pressure not reported	unknown
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.18	Pressure not reported	unknown