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Prog. Theor. Phys. Vol. 90 No. 3 (1993) pp. 499-512

Superconductivity in Two-Band Model

Masanori Ichioka, Tetsuo Ohmi and Toshihiko Tsuneto

Department of Physics, Kyoto University, Kyoto 606-01

(Received April 23, 1993)

Abstract:

Superconductivity in two-band models involving non s-wave pairing is investigated. We consider the following case: one band has s-wave pairing interaction and the other has non s-wave pairing interaction, and only s-wave Cooper pairs can be transferred between bands. Possible appearance of non s-wave superconducting order parameter in an s-wave superconducting state and its onset temperature are discussed. The non s-wave order parameter is suppressed by s-wave superconductivity, and cannot appear unless the non s-wave pairing interaction is stronger than critical value. We also consider the appearance of s-wave superconducting order parameter in a non s-wave superconducting state. In this case, the s-wave order parameter can always appear on lowering temperature. Temperature dependence of the order parameters and the specific heat are shown in a simple case.

URL : http://ptp.ipap.jp/link?PTP/90/499/
DOI : 10.1143/PTP.90.499

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Citing Article(s) :

1. Progress of Theoretical Physics Vol. 90 No. 3 (1993) pp. 513-519 :

   Collective Mode in Two-Band Superconductor

   Masanori Ichioka

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