Electric Polarization Induced by Néel Order without Magnetic Superlattice: Experimental Study of Cu3Mo2O9 and Numerical Study of a Small Spin Cluster
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概要
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We clarify that the antiferromagnetic order in the distorted tetrahedral quasi-one-dimensional spin system induces electric polarization. In this system, the effects of low dimensionality and magnetic frustration are expected to appear simultaneously. We obtain the magnetic-field--temperature phase diagram of Cu3Mo2O9 by studying the dielectric constant and spontaneous electric polarization. Around the tricritical point at 10 T and 8 K, the change in the direction of electric polarization causes a colossal magnetocapacitance. We calculate the charge redistribution in a small spin cluster consisting of two magnetic tetrahedra to demonstrate the electric polarization induced by the antiferromagnetism.
- 2011-08-15
著者
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EISAKI Hiroshi
National Institute of Advanced Industrial Science and Technology
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OKUBO Susumu
Molecular Photoscience Research Center, Kobe University
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Ito Toshimitsu
National Institute For Advanced Industrial Science And Technology
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HASE Masashi
National Institute for Materials Science (NIMS)
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Kuroe Haruhiko
Department Of Physics Sophia University
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Ohta Hitoshi
Molecular Photoscience Research Center Kobe University
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Oka Kunihiko
National Institute For Advanced Industrial Science And Technology
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Sekine Tomoyuki
Department Of Physics Faculty Of Science And Technology Sophia University
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Hosaka Tomohiro
Department of Physics, Sophia University, Chiyoda, Tokyo 102-8554, Japan
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Hachiuma Suguru
Department of Physics, Sophia University, Chiyoda, Tokyo 102-8554, Japan
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Fujisawa Masashi
Molecular Photoscience Research Center, Kobe University, Kobe 657-8501, Japan
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Fujisawa Masashi
Molecular Photoscience Research Center, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe 657-8501, Japan
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Okubo Susumu
Molecular Photoscience Research Center and Department of Physics, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
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Okubo Susumu
Molecular Photoscience Research Center, Kobe University, Kobe 657-8501, Japan
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Ito Toshimitsu
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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Ohta Hitoshi
Molecular Photoscience Research Center and Department of Physics, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
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Oka Kunihiko
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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