Orbital symmetry and electron correlation in NaxCoO2 -: art. no. 146402

被引：80
|
作者：
Wu, WB
Huang, DJ [1 ]
Okamoto, J
Tanaka, A
Lin, HJ
Chou, FC
Fujimori, A
Chen, CT
机构：
[1] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan
[2] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 30010, Taiwan
[3] Hiroshima Univ, ADSM, Dept Quantum Matters, Higashihiroshima 7398530, Japan
[4] MIT, Ctr Mat Sci & Engn, Cambridge, MA 02139 USA
[5] Univ Tokyo, Dept Complex Sci & Engn, Chiba 2778561, Japan
来源：
PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 14期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1103/PhysRevLett.94.146402
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Measurements of polarization-dependent soft x-ray absorption reveal that the electronic states determining the low-energy excitations of NaxCoO2 have predominantly a(1g) symmetry with significant O 2p character. In contrast to the prediction of band theory, doping-dependent O 1s x-ray absorption shows a large transfer of spectral weight, providing spectral evidence for strong electron correlations of the layered cobaltates. We also found that NaxCoO2 exhibits a charge-transfer electronic character rather than a Mott-Hubbard character.
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页数：4
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