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Electronic phase diagram of the layered cobalt oxide system LixCoO2 (0.0 ≤ x ≤ 1.0)

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Title: Electronic phase diagram of the layered cobalt oxide system LixCoO2 (0.0 ≤ x ≤ 1.0)
Authors: Motohashi, T. Browse this author →KAKEN DB
Ono, T. Browse this author
Sugimoto, Y. Browse this author
Masubuchi, Y. Browse this author
Kikkawa, S. Browse this author
Kanno, R. Browse this author
Karppinen, M. Browse this author
Yamauchi, H. Browse this author
Keywords: antiferromagnetic materials
charge-ordered states
electron correlations
lithium compounds
magnetic susceptibility
magnetic transitions
nuclear quadrupole resonance
Issue Date: Oct-2009
Publisher: American Physical Society
Journal Title: Physical Review B
Volume: 80
Issue: 16
Start Page: 165114
Publisher DOI: 10.1103/PhysRevB.80.165114
Abstract: Here we report the magnetic properties of the layered cobalt oxide system, LixCoO2, in the whole range of Li composition, 0 ≤ x ≤ 1. Based on dc-magnetic-susceptibility data, combined with results of Co-59 nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) observations, the electronic phase diagram of LixCoO2 has been established. As in the related material NaxCoO2, a magnetic critical point is found to exist between x=0.35 and 0.40, which separates the Pauli-paramagnetic and Curie-Weiss metals. In the Pauli-paramagnetic regime (x ≤ 0.35), the antiferromagnetic spin correlations systematically increase with decreasing x. Nevertheless, CoO2, the x=0 end member is a noncorrelated metal in the whole temperature range studied. In the Curie-Weiss regime (x ≥ 0.40), on the other hand, various phase transitions are observed. For x=0.40, a susceptibility hump is seen at 30 K, suggesting the onset of static antiferromagnetic order. A magnetic jump, which is likely to be triggered by charge ordering, is clearly observed at T-t ≈ 175 K in samples with x=0.50 (=1/2) and 0.67 (=2/3), while only a tiny kink appears at T ≈ 210 K in the sample with an intermediate Li composition, x=0.60. Thus, the phase diagram of the LixCoO2 system is complex and the electronic properties are sensitively influenced by the Li content (x).
Rights: © 2009 The American Physical Society
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 本橋 輝樹

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