Title: Orbital symmetry and electron correlation in NaxCoO2
Authors: Wu, WB
Huang, DJ
Okamoto, J
Tanaka, A
Lin, HJ
Chou, FC
Fujimori, A
Chen, CT
Department of Electrophysics
Issue Date: 15-Apr-2005
Abstract: 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.
URI: http://dx.doi.org/10.1103/PhysRevLett.94.146402
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.94.146402
Volume: 94
Issue: 14
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