Der Einfluß von Spinfluktuationen auf die Sprungtemperatur eines Zweibandsupraleiters |
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Authors: | P Entel W Klose Ø Fischer G Bongi |
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Institution: | 1. DPMC Université de Genève, 32 Boulevard d'Yvoy, Genf, Schweiz 2. Kernforschungszentrum Karlsruhe, D-7500, Karlsruhe, Bundesrepublik Deutschland
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Abstract: | The superconducting transition temperatureT c of a two band superconductor in the presence of magnetic and nonmagnetic impurities as well as exchange fields is calculated using a new (8 × 8)-matrix formalism for the electron Green's function. In particular we investigate the influence of spin correlations onT c near a magnetic phase transition. It is shown that in the strong interband phonon coupling limit the system behaves essentially as a one band superconductor. In the weak coupling limit we find typical deviations from one band theories. |
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