Detailed Information on Publication Record
2008
Origin of strong correlations and superconductivity in NaxCoO2
KHALIULLIN, Giniyat and Jiří CHALOUPKABasic information
Original name
Origin of strong correlations and superconductivity in NaxCoO2
Name in Czech
Původ silných korelací a supravodivosti v NaxCoO2
Authors
KHALIULLIN, Giniyat (276 Germany) and Jiří CHALOUPKA (203 Czech Republic, guarantor, belonging to the institution)
Edition
Physical Review B, USA, The American Physical Society, 2008, 1098-0121
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10302 Condensed matter physics
Country of publisher
United States of America
Confidentiality degree
není předmětem státního či obchodního tajemství
Impact factor
Impact factor: 3.322
RIV identification code
RIV/00216224:14310/08:00050957
Organization unit
Faculty of Science
UT WoS
000254542700128
Keywords in English
layered cobaltates; strong correlations; superconductivity
Tags
International impact, Reviewed
Změněno: 20/4/2012 09:18, Ing. Andrea Mikešková
V originále
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.
In Czech
Navrhujeme minimální model pro vrstevnaté kobaltáty NaxCoO2 založený na kvazidegeneraci stavů oktahedrálního komplexu CoO6 s různým spinem. Ukazujeme, že korelované přeskoky mezi t2g a eg stavy vedou ke vzniku spinových polaronů pro x blízké 1 a párování s s-symetrií při vyšším dopování.
Links
| MSM0021622410, plan (intention) |
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