Magnetic Excitations in Cu_2Fe_2Ge_4O_<13>(Low Dimensional Systems, Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)
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概要
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Magnetic excitations in the cooperative ordered state in a weakly coupled Fe chains and Cu dimers compound Cu_2Fe_2Ge_4O_<13> is studied by thermal neutron scattering technique. We show that the low energy excitations up to 10 meV in wide q range are well described by spin wave theory of weakly coupled Fe chains. In higher energy range a narrow band excitation that can be associated with Cu dimers is observed at 〓ω〜24 meV. Both types of excitations can be understood by treating the weak coupling between Fe chains and Cu dimers at the level of Mean Field/Random Phase Approximation.
- 理論物理学刊行会の論文
- 2005-10-31
著者
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UCHINOKURA Kunimitsu
Department of Advanced Materials Science, The University of Tokyo
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Zheludev Andrey
Condensed Matter Science Division Oak Ridge National Laboratory
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Zheludev Andrey
Condensed Matter Sciences Division Oak Ridge National Laboratory
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MASUDA Takatsugu
Condensed Matter Sciences Division, Oak Ridge National Laboratory
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SALES Brian
Condensed Matter Sciences Division, Oak Ridge National Laboratory
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IMAI Suguru
Department of Advanced Materials Science, The University of Tokyo
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Masuda Takatsugu
Condensed Matter Sciences Division Oak Ridge National Laboratory:international Graduate School Of Ar
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Uchinokura Kunimitsu
Department Of Advanced Materials Science The University Of Tokyo
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Uchinokura Kunimitsu
Department Of Advanced Materials Science The University Of Tokyo:the Institute Of Physical And Chemi
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Sales Brian
Condensed Matter Sciences Division Oak Ridge National Laboratory
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Imai Suguru
Department Of Advanced Materials Science The University Of Tokyo:yokohama R&d Laboratories The F
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UCHINOKURA Kunimitsu
Department of Advanced Materials Science, The University of Tokyo:The Institute of Physical and Chemical Research (RIKEN)
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ZHELUDEV Andrey
Condensed Matter Sciences Division, Oak Ridge National Laboratory
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IMAI Suguru
Department of Advanced Materials Science, The University of Tokyo:Yokohama R&D Laboratories, the Furukawa Electric Co., Ltd.
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