Recovery of superconductivity and the critical field in layered superconductors

Yu. N. Ovchinnikov; V. Z. Kresin

doi:10.1103/PhysRevB.54.1251

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Recovery of superconductivity and the critical field in layered superconductors

Yu. N. Ovchinnikov, V. Z. Kresin

DOI 10.1103/PhysRevB.54.1251 · Physical Review B

T1

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Abstract

The presence of magnetic impurities greatly affects the temperature dependence of the critical field Hc2. We focus, mainly, on layered superconductors. As a result of correlations among magnetic impurities, the scattering amplitude Γs decreased with T→0 K. This temperature dependence leads to a weakening of the pair-breaking effect and consequently to a positive curvature of Hc2(T) and a drastic increase in Hc2(0). The calculations are in excellent agreement with recent experimental data. It is also shown that the presence of inhomogeneities of a certain size also modifies the temperature dependence of Hc2. © 1996 The American Physical Society.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Tl2Ba2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	unknown
Tl2Ba2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	14	Pressure not reported	unknown
Sm1.85Ce0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown