Spin-Wave Theory of the Multiple-Spin Exchange Model on a Triangular Lattice in a Magnetic Field : 3-Sublattice Structures(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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We study the spin wave in the S=1/2 multiple-spin exchange model on a triangular lattice in a magnetic field within the linear spin-wave theory. We take only two-, three-, and four-spin exchange interactions into account and restrict ourselves to the region where a coplanar three-sublattice state is the mean-field ground state. We found that the Y-shape ground state survives quantum fluctuations and the phase transition to a phase with a 6-sublattice structure occurs with softening of the spin wave. We estimated the quantum corrections to the ground state sublattice magnetizations due to zero-point spin-wave fluctuations.
- 社団法人日本物理学会の論文
- 2006-10-15
著者
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KUBO Kenn
Department of Physics, Aoyama Gakuin University
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Kubo Kenn
Department Of Physics And Mathematics Aoyama Gakuin University
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YASUDA Chitoshi
Department of Physics and Mathematics, Aoyama Gakuin University
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Yasuda Chitoshi
Department Of Physics And Mathematics Aoyama Gakuin University
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Yasuda Chitoshi
Department Of Physics And Earth Sciences Faculty Of Science University Of The Ryukyus
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KINOUCHI Daisuke
Department of Physics and Mathematics, Aoyama Gakuin University
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Kinouchi Daisuke
Department Of Physics And Mathematics Aoyama Gakuin University
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KUBO Kenn
Department of Physics and Astronomy,Michigan State University
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