Competition between singlet and triplet pairings in NaxCoO2•y H2O -: art. no. 024506

被引：43

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 B | 2005年 / 71卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.71.024506

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We discuss the pairing symmetry of a cobaltate superconductor NaxCoO2.y H2O by adopting an effective single-band model that takes into account the e(g)(') hole pockets, as discussed in our previous paper [Phys. Rev. Lett. 93, 077001 (2004)]. Here we consider the off-site repulsions in addition to the on-site repulsion considered in our previous study. We show that the spin-triplet f-wave pairing proposed in our previous study is robust to some extent even in the presence of off-site repulsions. However, f-wave pairing gives way to singlet pairings for sufficiently large values of off-site repulsions. Among the singlet pairings, i-wave and extended s-wave pairings are good candidates which do not break time reversal symmetry below T-c in agreement with the experiments.

引用

页数：10