Crib-shaped triplet-pairing gap function for an orthogonal pair of quasi-one-dimensional Fermi surfaces in Sr2RuO4 -: art. no. 060506

被引：56

作者：

Kuroki, K ^{[1
]}

Ogata, M ^{[1
]}

Arita, R ^{[1
]}

Aoki, H ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW B | 2001年 / 63卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.63.060506

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The competition between spin-triplet and singlet pairings is studied theoretically for the tight-binding alpha-beta bands in Sr2RuO4, which arise from two sets of quasi-one-dimensional Fermi surfaces. Using the multiband fluctuation exchange approximation, where we incorporate an anisotropy in the spin fluctuations as suggested from experiments, we show that (i) the tripler can dominate over the singlet (which turns out to be extended s), and (ii) the triplet gap function optimized in the Eliashberg equation has an unusual, very nonsinusoidal form, whose time-reversal-broken combination exhibits a crib-shaped amplitude with dips.

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