Li7RuO6: As a 4d Heisenberg Frustrated Magnet
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概要
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The structural and magnetic properties of Li7RuO6 were investigated in single crystals. This ruthenate is composed of quasi-two-dimensional distorted triangular lattices of RuO6 octahedra isolated from each other. Because of the $(t_{2g})^{3}$ electron configuration of Ru5+, a Heisenberg-type magnetic behavior of $S=3/2$ spins is expected. The magnetic susceptibility reveals an antiferromagnetic transition at $T_{\text{N}}=6.5$ K, much lower than the absolute value of the Weiss temperature $\Theta=-75$ K, indicating a strong geometric frustration. The small and almost isotropic drop of the susceptibility below $T_{\text{N}}$ suggests a helical magnetic structure. Specific heat revealed an additional phase transition at $T'_{\text{N}}=12$ K, suggesting an unconventional magnetic phase diagram.
- 2010-06-15
著者
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Kazuyoshi YOSHIMURA
Department of Chemistry,Faculty of Science,Kyoto University
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Sato Hirohiko
Department Of Biotechnology Tokyo University Of Agriculture And Technology
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Nakajima Kanako
Department Of Physics Chuo University
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Yasuo Narumi
The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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Koichi Kindo
The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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Fukui Tomoya
The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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Masahiro Iwaki
The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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Yutaka Itoh
Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
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Chishiro Michioka
Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
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Tomoya Fukui
The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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Kanako Nakajima
Department of Physics, Chuo University, 1-13-27 Kasuga, Bunkyo, Tokyo 112-8551, Japan
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Kazuyoshi Yoshimura
Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
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NAKAJIMA Kanako
Department of Food Science, Niigata University of Pharmacy and Applied Life Sciences
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