Measurement of electron correlations in LixCoO2 (x=0.0–0.35) using 59Co nuclear magnetic resonance and nuclear quadrupole resonance techniques

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Journal Title
Journal ISSN
Volume Title
School of Chemical Technology | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2009
Major/Subject
Mcode
Degree programme
Language
en
Pages
220514/1-4
Series
Physical Review B, Volume 79, Issue 22
Abstract
CoO2 is the parent compound for the superconductor NaxCoO2⋅1.3H2O and was widely believed to be a Mott insulator. We performed C59o nuclear magnetic resonance and nuclear quadrupole resonance studies on LixCoO2 (x=0.35, 0.25, 0.12, and 0.0) to uncover the electronic state and spin correlations in this series of compounds which was recently obtained through electrochemical deintercalation of Li from pristine LiCoO2. We find that although the antiferromagnetic spin correlations systematically increase with decreasing Li content (x), the end member, CoO2, is a noncorrelated metal that well satisfies the Korringa relation for a Fermi liquid. Thus, CoO2 is not simply located at the limit of x→0 for AxCoO2 (A=Li,Na) compounds. The disappearance of the electron correlations in CoO2 is due to the three dimensionality of the compound which is in contrast to the highly two-dimensional structure of AxCoO2.
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Keywords
nuclear magnetic resonance, nuclear quadrupole resonance techniques, superconductors, electronic state, spin correlations
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Citation
Kawasaki, S. & Motohashi, T. & Shimada, K. & Ono, T. & Kanno, R. & Karppinen, Maarit & Yamauchi, H. & Zheng, Guo-qing. 2009. Measurement of electron correlations in LixCoO2 (x=0.0-0.35) using 59Co nuclear magnetic resonance and nuclear quadrupole resonance techniques. Physical Review B. Volume 79, Issue 22. 220514/1-4. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.79.220514.