Possible spin-triplet f-wave pairing due to disconnected Fermi surfaces in NaxCoO2•yH2O -: art. no. 077001

被引：83

作者：

Kuroki, K ^{[1
]}

Tanaka, Y

Arita, R

机构：

[1] Univ Electrocommun, Dept Appl Phys & Chem, Tokyo 1828585, Japan

[2] Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan

[3] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.93.077001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We propose that the spin-triplet pairing mechanism due to disconnected Fermi surfaces proposed in our previous study [Phys. Rev. B 63, 174507 (2001)] may be at work in a recently discovered superconductor NaxCoO2.yH(2)O. We introduce a single band effective model that takes into account the pocketlike Fermi surfaces along with the van Hove singularity near the K point found in the band calculation results. Applying the fluctuation exchange method and solving the linearized Eliashberg equation, the most dominant pairing is found to have spin-triplet f-wave symmetry, where the nodes of the gap function do not intersect the pocket Fermi surfaces. The presence of finite T-c is suggested in sharp contrast to cases when the gap nodes intersect the Fermi surface.

引用

页码：077001 / 1

页数：4

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