Restoration of Superconductivity in High Parallel Magnetic Fields in Layered Superconductors

A. G. Lebed; K. Yamaji

doi:10.1103/PhysRevLett.80.2697

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Restoration of Superconductivity in High Parallel Magnetic Fields in Layered Superconductors

A. G. Lebed, K. Yamaji

DOI 10.1103/PhysRevLett.80.2697 · Physical Review Letters

T1

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Abstract

We derive an equation determining the upper critical field Hc2‖(T) parallel to conducting planes of a layered superconductor from the BCS theory. It extends the descriptions of Hc2‖(T) within the Ginzburg-Landau-Abrikosov-Gor'kov theory and the Lawrence-Doniach model to the case of strong magnetic fields. From this equation, it follows that orbital effects of an electron motion along an open Fermi surface in a magnetic field start to restore superconductivity at magnetic fields higher than the quasiclassical upper critical field and result in the appearance of a reentrant phase with Tc(H)≃Tc(0). A stability of the reentrant phase against fluctuations is discussed.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.8	Pressure not reported	unknown
TlBa2CaCu2Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	100	Pressure not reported	unknown
Tl2Sr2Ca3Cu4Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	150	Pressure not reported	unknown
(b-ET)2AuI2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.5	Pressure not reported	unknown
(k-ET)2I3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7	Pressure not reported	unknown