A crib-shaped triplet pairing gap function for an orthogonal pair of quasi-one dimensional Fermi surfaces in Sr2RuO4
A crib-shaped triplet pairing gap function for an orthogonal pair of quasi-one dimensional Fermi surfaces in Sr2RuO4
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Sr2RuO4 准一维费米面正交对的婴儿床形三重态配对间隙函数
DOI：
10.1103/physrevb.63.060506
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发表时间：
2001
影响因子：
3.7
通讯作者：
H. Aoki
中科院分区：
文献类型：
--
作者：
K. Kuroki;M. Ogata;R. Arita;H. Aoki
从理论上研究了Sr2RuO4紧束缚带中自旋三重态与自旋单重态之间的竞争.使用多带FLEX近似，其中我们将各向异性的自旋波动从实验中建议，我们表明：（i）三重态可以占主导地位的单线态（原来是扩展的s），和（ii）在Eliashberg方程中优化的三重态间隙函数有一个不寻常的，非常非正弦的形式，其时间反演破碎的组合表现出一个摇篮形的振幅与下降。
The competition between spin-triplet and singlet pairings is studied theoretically for the tight-binding $\alpha$-$\beta$ bands in Sr$_2$RuO$_4$, which arise from two sets of quasi-one dimensional Fermi surfaces. Using multiband FLEX approximation, where we incorporate an anisotropy in the spin fluctuations as suggested from experiments, we show that (i) the triplet 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 non-sinusoidal form, whose time-reversal-broken combination exhibits a crib-shaped amplitude with dips.