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@article{762823,
author = {Khaliullin, Giniyat and Chaloupka, Jiří},
article_location = {USA},
article_number = {10},
doi = {http://dx.doi.org/10.1103/PhysRevB.77.104532},
keywords = {layered cobaltates; strong correlations; superconductivity},
language = {eng},
issn = {1098-0121},
journal = {Physical Review B},
title = {Origin of strong correlations and superconductivity in NaxCoO2},
volume = {77},
year = {2008}
}
TY - JOUR
ID - 762823
AU - Khaliullin, Giniyat - Chaloupka, Jiří
PY - 2008
TI - Origin of strong correlations and superconductivity in NaxCoO2
JF - Physical Review B
VL - 77
IS - 10
SP - 104532-104537
EP - 104532-104537
PB - The American Physical Society
SN - 10980121
KW - layered cobaltates
KW - strong correlations
KW - superconductivity
N2 - We propose a minimal model resolving a puzzle of enigmatic correlations observed in sodium-rich NaxCoO2 where one expects a simple, free motion of the dilute S = 1 / 2 holes doped into a band insulator NaCoO2. The model also predicts singlet superconductivity at experimentally observed compositions. The model is based on a key property of cobalt oxides - the spin-state quasidegeneracy of CoO6 octahedral complex -leading to an unusual physics of, e.g., LaCoO3. We show that correlated hopping between t2g and eg states leads to the spin-polaron physics at x~1, and to an extended s-wave pairing at larger doping when coherent fermionic bands are formed.
ER -
KHALIULLIN, Giniyat and Jiří CHALOUPKA. Origin of strong correlations and superconductivity in NaxCoO2. \textit{Physical Review B}. USA: The American Physical Society, 2008, vol.~77, No~10, p.~104532-104537. ISSN~1098-0121. Available from: https://dx.doi.org/10.1103/PhysRevB.77.104532.
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