Role of anisotropy of the coupling constant in a superconductor model with singularities near the Fermi surface |
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Authors: | N V Shchedrina M I Shchedrin |
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Institution: | (1) Volga State Academy of Water Transportation, 603600 Nizhny Novgorod, Russia |
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Abstract: | The role of anisotropy of the coupling constant in the influence of nonmagnetic impurities on the behavior of the superconducting
transition temperature T
c is investigated in the high-temperature superconductor (HTSC) model, where high values of T
c result from an increase in the density of states near the Fermi surface. It is shown that this model is more sensitive to
impurities than the BCS model; Anderson compensation does not occur in the HTSC model, even for identical distributions of
the densities of states in the superconducting and impurity channels, and the impurity contributions are no longer linear
with respect to the impurity concentration in the vicinity of T
c. Anisotropy of the superconducting gap Δ and the possibility of its disappearance at certain points on the Fermi surface
due to various types of pairing are manifested in the stability of the superconducting phase against the influence of impurities.
Fiz. Tverd. Tela (St. Petersburg) 39, 1940–1942 (November 1997) |
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