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The Ginzburg-Landau expansion and the slope of the upper critical field in disordered superconductors

Authors:	A I Posazhennikova M V Sadovskii

Institution:	(1) Institute of Electrophysics, Ural Branch of the Russian Academy of Sciences, 620049 Ekaterinburg, Russia

Abstract:	It is shown that the slope of the upper critical field $\left\| {dH_{c2} /dT} \right\|_{T_c }$ in superconductors with d pairing drops rapidly with increasing concentration of normal impurities, while in superconductors with anisotropic s pairing $\left\| {dH_{c2} /dT} \right\|_{T_c }$ increases and reaches the well-known asymptotic level characteristic for the isotropic case. This difference makes it possible, in principle, to employ measurements of H _c2 in disordered superconductors as an experimental method for determining the type of pairing in high-T _c superconductors and systems with heavy fermions. Pis’ma Zh. éksp. Teor. Fiz. 63, No. 5, 347–352 (10 March 1996)

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