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Phase Diagram of the Pairing Symmetry in Two-dimensional Strong-coupling Superconductors by Sakai, Katsuji; Yokoya, Yasushi; Nakamura, Yoshiko Oi is a scholarly article available to read on EtoBox.

What is Phase Diagram of the Pairing Symmetry in Two-dimensional Strong-coupling Superconductors about?

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 $\mu$ 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 $\mu$ 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 $\mu$ 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.

Author

Sakai, Katsuji; Yokoya, Yasushi; Nakamura, Yoshiko Oi

Published

1998

Language

EN