Unique Phase Transition on Spin-2 Triangular Lattice of Ag_2MnO_2(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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Ag_2MnO_2 is studied as a possible candidate compound for an antiferromagnetic XY spin model on a triangular lattice. In spite of the large Curie-Weiss temperature of -430K found in magnetic susceptibility, Mn^<3+> spins with S=2 do not undergo a conventional long-range order down to 2K probably owing to the geometrical frustration and two dimensionality in the system. Instead, a unique phase transition is found at 80K, where specific heat exhibits a clear sign of a second-order phase transition, while magnetic susceptibility changes smoothly without a distinct anomaly. We think that this transition is related to the chirality degree of freedom associated with a short-range order, which has been expected for the classical XY spin model on a triangular lattice. On further cooling, spin-glass-like behavior is observed below 22K, possibly corresponding to a quasi-long-range order.
- 社団法人日本物理学会の論文
- 2008-07-15
著者
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広井 善二
京都大学化学研究所
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OKAMOTO Yoshihiko
Institute for Solid State Physics, University of Tokyo
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YAMAURA Jun-Ichi
Institute for Solid State Physics, University of Tokyo
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HIROI Zenji
Institute for Solid State Physics, University of Tokyo
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Jansen Martin
Max-Planck Institute
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YOSHIDA Hiroyuki
Institute for Solid State Physics, University of Tokyo
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広井 善二
Institute For Solid State Physics University Of Tokyo
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Yamamura Jun-ichi
Institute For Solid State Physics University Of Tokyo
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Yamaura J
Univ. Tokyo Chiba
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Yamaura Junichi
Materials Design And Characterization Laboratory Institute For Solid State Physics University Of Tok
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Yamaura J
Univ. Tokyo Chiba Jpn
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Yamaura J
Institute For Solid State Physics University Of Tokyo
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Yamaura Jun-ichi
Institute For Solid State Physics The University Of Tokyo
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Hiroi Z
Institute For Solid State Physics University Of Tokyo
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Hiroi Zenji
Institute For Chemical Research Kyoto University
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HIROI Zenji
ISSP, University of Tokyo
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Okamoto Yoshihiko
Univ. Tokyo Chiba
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Okamoto Yoshihiko
Institute For Solid State Physics University Of Tokyo
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Okamoto Yoshihiko
Riken (the Institute Of Physical And Chemical Research):crest Japan Science And Technology Agency (j
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AHLERT Sascha
Max-Planck-Institut fur Festkoperforschung
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Hiroi Z
Univ. Tokyo Kashiwa Jpn
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Jansen Martin
Max-planck-institut Fur Festkoperforschung
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Yoshida Hiroyuki
Institute For Solid State Physics University Of Tokyo
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Yasuda Jun
Institute For Solid State Physics University Of Tokyo
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