Universal reduction of Tc in strong-coupling superconductors by a small concentration of magnetic impurities

Mark Jarrell

doi:10.1103/PhysRevB.41.4815

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Universal reduction of Tc in strong-coupling superconductors by a small concentration of magnetic impurities

Mark Jarrell

DOI 10.1103/PhysRevB.41.4815 · Physical Review B

T1

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Abstract

The first exact calculation of Tc in the presence of a dilute concentration c of uncorrelated magnetic impurities is presented. The shape of Tc(c) is universal, Tc(c)/Tc0 =h[cf(λ0)/N(0)Tc0,TK/Tc0]. The detailed shape of Tc(c)/Tc0 is qualitatively and quantitatively different from that found by previous approximate theories. Tc(c) depends strongly upon the electron-phonon coupling λ0. There is no indication of a low-temperature tail of positive curvature for TK/Tc0<1, or the associated third transition temperature Tc3, both predicted by Müller-Hartmann and Zittartz. My results agree well with experimental data.

Source-reported materials — not catalogue approval

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