Critical Slowing Down of Triangular Lattice Spin-3/2 Heisenberg Antiferromagnet Li_7RuO_6 via ^7Li NMR(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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We report on ^7Li NMR studies of single crystals of the triangular-lattice Heisenberg antiferromagnet Li_7RuO_6. A slow critical divergence with a wide critical region of |T/T_N-1|≤7 was observed in ^7Li nuclear spin-lattice relaxation rate. The slowing down of staggered spin fluctuations was analyzed in a renormalized classical region of a two-dimensional triangular-lattice nonlinear sigma model. Spin stiffness constant was found to decrease to about 20% of its value in spin-wave approximation. The effect of spin frustration, e.g., Z_2 vortex excitations on critical phenomena, is suggested.
- 社団法人日本物理学会の論文
- 2009-02-15
著者
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YOSHIMURA Kazuyoshi
Department of Chemistry, Graduate School of Science, Kyoto University
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YOSHIMURA Kazuyoshi
Graduate School of Science, Kyoto University
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Yoshimura Kazuyoshi
Department Of Applied Science Tokyo Electrical Engineering College
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ITOH Yutaka
Department of Chemistry, Graduate School of Science, Kyoto University
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SATO Hirohiko
Department of Chemistry,Graduate School of Science and Engineering,Tokyo Institute of Technology
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MICHIOKA Chishiro
Department of Chemistry, Graduate School of Science, Kyoto University
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Itoh Yutaka
Department Of Chemistry Graduate School Of Science Kyoto University
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Michioka Chishiro
Department Of Chemistry Graduate School Of Science Kyoto University
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Michioka C
Department Of Chemistry Graduate School Of Science Kyoto University
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Sato Hirohiko
Department Of Chemistry Faculty Of Science Kyoto University
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NAKAJIMA Kanako
Department of Physics, Chuo University
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Yoshimura Kazuyoshi
Graduate School 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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Michioka Chishiro
Graduate School of Science, Kyoto University
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NAKAJIMA Kanako
Department of Food Science, Niigata University of Pharmacy and Applied Life Sciences
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