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@article{818776,
author = {Chaloupka, Jiří and Khaliullin, Giniyat},
article_location = {Japonsko},
article_number = {1},
keywords = {sodium cobaltates; superconductivity; electron correlations},
language = {eng},
issn = {0375-9687},
journal = {Progress of Theoretical Physics Supplement},
title = {Unusual Electron Correlations in NaxCoO2 Due to the Spin-State Quasidegeneracy of Cobalt Ions},
volume = {176},
year = {2008}
}
TY - JOUR
ID - 818776
AU - Chaloupka, Jiří - Khaliullin, Giniyat
PY - 2008
TI - Unusual Electron Correlations in NaxCoO2 Due to the Spin-State Quasidegeneracy of Cobalt Ions
JF - Progress of Theoretical Physics Supplement
VL - 176
IS - 1
SP - 50-76
EP - 50-76
PB - Physical Society of Japan
SN - 03759687
KW - sodium cobaltates
KW - superconductivity
KW - electron correlations
N2 - Recent studies exposed many remarkable properties of layered cobaltates NaxCoO2. Surprisingly, many-body effects have been found to increase at sodium-rich compositions of NaxCoO2 where one expects a simple, nearly free motion of the dilute S=1/2 holes doped into a band insulator NaCoO2. Here we discuss the origin of enigmatic correlations that turn a doped NaCoO2 into a strongly correlated electronic system. A minimal model including orbital degeneracy is proposed and its predictions are discussed. The model is based on a key property of cobalt oxides - the spin-state quasidegeneracy of CoO6 octahedral complex - which has been known, e.g., in the context of an unusual physics of LaCoO3 compound. Another important ingredient of the model is the 90 Co-O-Co bonding in NaxCoO2 which allows nearest-neighbor t2g-eg hopping.
ER -
CHALOUPKA, Jiří a Giniyat KHALIULLIN. Unusual Electron Correlations in NaxCoO2 Due to the Spin-State Quasidegeneracy of Cobalt Ions. \textit{Progress of Theoretical Physics Supplement}. Japonsko: Physical Society of Japan, roč.~176, č.~1, s.~50-76. ISSN~0375-9687. 2008.
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