Magnetization Plateaus and Magnetic Excitations in the S=1/2 Spin Ladder Antiferromagnet NH_4CuCl_3(Magnetization Plateaus, Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)
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概要
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Field-induced magnetic phases are investigated in one-dimensional S=1/2 generalized spin ladder systems having the lattice modulation along the leg with the wavevector π/2a, a being the lattice constant, using numerical calculations. We point out that there exist cases where the 1/4- as well as the 3/4-magnetization plateaus appear but the 1/2-plateau does not, for an appropriate set of the parameters. Triplet excitations in the plateau regions are discussed in connection with the experimental result, which provides possible implications for the important role of the interaction between triplets.
- 理論物理学刊行会の論文
- 2005-10-31
著者
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Harada Isao
Department Of Physics Faculty Of Science Kobe University
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Miyazaki Hiroshi
Department Of Physics Faculty Of Science Okayama University
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Miyazaki Hiroshi
Department Applied Physics Tohoku University
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MIYAZAKI Hiroshi
Department of Physics, Faculty of Science, Okayama University
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HARADA Isao
Department of Physics, Faculty of Science, Okayama University
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