Unified origin for superconductivity, magnetism, and large thermopower in NaxCoO2

被引：1
|
作者：
Kuroki, K. [1 ]
Arita, R. [2 ]
Okubo, S. [1 ]
Nojima, T. [1 ]
Usui, H. [1 ]
Onari, S. [3 ]
Tanaka, Y. [3 ]
机构：
[1] Univ Electrocommun, Dept Appl Phys & Chem, Tokyo 1828585, Japan
[2] RIKEN, Wako, Saitama 3510198, Japan
[3] Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2008年 / 69卷 / 12期
基金：
日本学术振兴会;
关键词：
Superconductivity; Fermi surface;
D O I：
10.1016/j.jpcs.2008.06.131
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
We argue that the large thermopower, magnetism, and superconductivity observed in NaxCoO2 share the same origin, namely, the peculiar shape of the a(1g) band. Superconductivity and magnetism arise from the local minimum structure of the band at the Gamma point, while the thermopower originates from the overall "pudding mold" shape of the band. Our study shows the importance of the band structure and the Fermi surface even in strongly correlated systems. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码：3360 / 3364
页数：5
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