Phase diagram of the pairing symmetry in two-dimensional strong-coupling superconductors

Two-dimensional Eliashberg equations have been solved by use of a mixed interaction with s- and d-channels. It is discussed what kind of pairing symmetry of the superconducting state can be realized when the channel mixing parameters and the band-filling are varied. By changing the mixing parameters...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 1997-05, Vol.279 (1), p.127-135
Main Authors: Sakai, Katsuji, Yokoya, Yasushi, Oi Nakamura, Yoshiko
Format: Article
Language:English
Subjects:
Band-filling
High- Tc
Mixed interaction of s- and d-wave
Pairing symmetry
Two-dimensional strong-coupling superconductor
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Summary:Two-dimensional Eliashberg equations have been solved by use of a mixed interaction with s- and d-channels. It is discussed what kind of pairing symmetry of the superconducting state can be realized when the channel mixing parameters and the band-filling are varied. By changing the mixing parameters and varying the chemical potential μ between zero- and half-filling, the pairing symmetry is determined and summarized into a phase diagram of the symmetry. It is revealed that there is an effective threshold in μ for the appearance of the d-wave superconductivity regardless of the strength of the d-channel interaction. It is also shown that, although the s-wave superconductivity can occur for any value of μ if the s-channel interaction is mixed sufficiently, the d-wave superconductivity has the advantage of achieving a high- T c over the s-wave one, once it occurs.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(97)00139-1