Abstract
CoO2 is the parent compound for the superconductor Nax CoO2 1.3 H2 O and was widely believed to be a Mott insulator. We performed C 59 o nuclear magnetic resonance and nuclear quadrupole resonance studies on Lix CoO2 (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 Ax CoO2 (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 Ax CoO2.
| Original language | English |
|---|---|
| Article number | 220514 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 79 |
| Issue number | 22 |
| DOIs | |
| Publication status | Published - Jun 24 2009 |
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ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
Cite this
Measurement of electron correlations in Lix CoO2 (x=0.0-0.35) using C 59 o nuclear magnetic resonance and nuclear quadrupole resonance techniques. / Kawasaki, Shinji; Motohashi, T.; Shimada, K.; Ono, T.; Kanno, R.; Karppinen, M.; Yamauchi, H.; Zheng, Guo-Qing.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 79, No. 22, 220514, 24.06.2009.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Measurement of electron correlations in Lix CoO2 (x=0.0-0.35) using C 59 o nuclear magnetic resonance and nuclear quadrupole resonance techniques
AU - Kawasaki, Shinji
AU - Motohashi, T.
AU - Shimada, K.
AU - Ono, T.
AU - Kanno, R.
AU - Karppinen, M.
AU - Yamauchi, H.
AU - Zheng, Guo-Qing
PY - 2009/6/24
Y1 - 2009/6/24
N2 - CoO2 is the parent compound for the superconductor Nax CoO2 1.3 H2 O and was widely believed to be a Mott insulator. We performed C 59 o nuclear magnetic resonance and nuclear quadrupole resonance studies on Lix CoO2 (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 Ax CoO2 (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 Ax CoO2.
AB - CoO2 is the parent compound for the superconductor Nax CoO2 1.3 H2 O and was widely believed to be a Mott insulator. We performed C 59 o nuclear magnetic resonance and nuclear quadrupole resonance studies on Lix CoO2 (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 Ax CoO2 (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 Ax CoO2.
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U2 - 10.1103/PhysRevB.79.220514
DO - 10.1103/PhysRevB.79.220514
M3 - Article
AN - SCOPUS:68949087024
VL - 79
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 22
M1 - 220514
ER -