Ferromagnetic fluctuation and superconductivity in Na0.35CoO2 • 1.3H2O:: FLEX study of multi-orbital Hubbard model

被引：0
|
作者：
Mochizuki, M [1 ]
Yanase, Y [1 ]
Ogata, M [1 ]
机构：
[1] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan
来源：
PHYSICA B-CONDENSED MATTER | 2005年 / 359卷
关键词：
Na0.35CoO2 center dot 1.3H(2)O; orbital degree of freedom; Hund's-rule coupling; triplet superconductivity;
D O I：
10.1016/j.physb.2005.01.161
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Spin and charge fluctuations and superconductivity in Na0.35CoO2 center dot 1.3H(2)O are studied based on a multi-orbital Hubbard model. By applying the fluctuation exchange (FLEX) approximation, we show that the Hund's-rule coupling between the Co t(2g) orbitals causes ferromagnetic spin fluctuation. Triplet pairing is favored by this ferromagnetic fluctuation on the hole-pocket band. We propose that, in Na0.35CoO2 center dot 1.3H(2)O, Co t(2g) orbitals and inter-orbital Hund's-rule coupling play important roles on the triplet pairing, and this compound can be a first example of the triplet superconductor mediated by inter-orbital interaction-induced ferromagnetic fluctuation. (c) 2005 Elsevier B.V. All rights reserved.
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页码：594 / 596
页数：3
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