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Magnetization plateaux of the S = 5/2 antiferromagnetic chain with anisotropies
Tomoki Houda1, Kiyomi Okamoto1, Hiroki Nakano2
1Graduate School of Science, University of Hyogo, Kamigori, Ako-gun, Hyogo, 678-1297, Japan.
Abstract:
The magnetization process of the S=5/2 antiferromagnetic chain with coupling and single-ion anisotropies is investigated using numerical diagonalization of finite-size clusters and level spectroscopy analysis. Various magnetization plateaux are found at 1/5, 2/5, 3/5, and 4/5 of the saturation magnetization. Plateaux without translational symmetry breaking are predicted to occur at 1/5 and 3/5 magnetization. A symmetry-protected topological plateau phase is found at 3/5 magnetization, but not at 1/5. In addition translational-symmetry-broken plateaux induced by large coupling anisotropy are found at 1/5, 2/5, 3/5, and 4/5 magnetization. Phase diagrams at 1/5, 2/5, 3/5, and 4/5 of the saturation magnetization are obtained. Magnetization curves for several representative anisotropies are also presented, together with the corresponding magnetic phase diagrams.
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