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

机译：使用59Co核磁共振和核四极共振技术测量LixCoO2（x = 0.0–0.35）中的电子相关性

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摘要

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.
机译：CoO2是超导体NaxCoO2·1.3H2O的母体化合物，被广泛认为是Mott绝缘体。我们对LixCoO2（x = 0.35、0.25、0.12和0.0）进行了C59o核磁共振和核四极共振研究，以揭示这一系列化合物的电子态和自旋相关性，这是最近通过从原始LiCoO2电化学脱嵌Li获得的。我们发现，尽管反铁磁自旋相关性随着Li含量（x）的降低而系统地增加，但末端成员CoO2是一种不相关的金属，可以很好地满足费米液体的Korringa关系。因此，对于AxCoO2（A = Li，Na）化合物，CoO2不能简单地位于x→0的极限处。 CoO2中电子相关性的消失归因于化合物的三维，这与AxCoO2的高度二维结构相反。

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