Magnetic Excitation and Electric Polarization in Strongly Coupled Spin Monomer and Dimer System Cu3Mo2O9
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概要
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Magnetic excitation in strongly coupled spin monomer and dimer system is studied theoretically focusing on Cu3Mo2O9 as an typical example, where Cu3Mo2O9 shows an antiferromagnetic long-range order at zero field. Introducing formfactors of dimers, we present the formulation for magnetic excitations. Under an external magnetic field, an additional field-induced quantum phase transition takes place due to the stabilization of a triplet state of the dimer. The recent experimental study revealed that Cu3Mo2O9 shows an multiferroic behavior with an electric polarization in the magnetically ordered state. According to the field-induced transition, we find that the electric polarization should change drastically.
- 2012-02-15
著者
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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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Sekine Tomoyuki
Department Of Physics Faculty Of Science And Technology Sophia University
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Matsumoto Masashige
Department Of Physics Faculty Of Science Shizuoka University
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Hase Masashi
National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan
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Kuroe Haruhiko
Department of Physics, Sophia University, Chiyoda, Tokyo 102-8554, Japan
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Sekine Tomoyuki
Department of Physics, Sophia University, Chiyoda, Tokyo 102-8554, Japan
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