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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, 2008, roč.~176, č.~1, s.~50-76. ISSN~0375-9687.
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