Superconductivity in Sr2RuO4 mediated by Coulomb scattering

被引：31

作者：

Koikegami, S ^{[1
]}

Yoshida, Y

Yanagisawa, T

机构：

[1] AIST, Nanoelect Res Inst, Tsukuba Cent 2, Tsukuba, Ibaraki 3058568, Japan

[2] Japan Soc Promot Sci, Chiyoda Ku, Tokyo 1028471, Japan

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.67.134517

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the superconductivity in Sr2RuO4 on the basis of the three-dimensional three-band Hubbard model. We propose a model with Coulomb interactions among the electrons on the nearest-neighbor Ru sites. In our model the intersite Coulomb repulsion and exchange coupling can work as the effective interaction for the spin-triplet paring. This effective interaction is enhanced by the band hybridization, which is mediated by the interlayer transfers. We investigate the possibility of this mechanism in the ground state and find that the orbital dependent spin-triplet superconductivity is more stable than the spin-singlet one for realistic parameters. This spin-triplet superconducting state has horizontal line nodes on the Fermi surface.

引用

页数：6

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