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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