Magnetization Plateaus in the Shastry-Sutherland Model for SrCu_2(BO_3)_2 : Results of Fourth-Order Perturbation Expansion with a Low-Density Approximation : Condensed Matter: Electronic Properties, etc.
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概要
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Magnetization plateaus in the Shastry-Sutherland model for SrCu_2 (BO_3)_2 are studied by the perturbation expansion method. The fourth-order effective Hamiltonian which describes the dynamics of triplet dimers (TD'S) with S^<tot>_z = 1 in the singlet sea is derived and then partially diagonalized for the space that consists of the TD configurations with the lowest second-order energy. The fourth-order terms are treated within a low-density approximation. Our procedure makes clear how TD interactions are responsible for the formation of magnetization plateaus. Particularly, the 1/4-plateau is obtained by the fourth-neighbor TD repulsion in the fourth-order perturbation, and a diagonal stripe arrangement of TD's appears at this plateau.
- 社団法人日本物理学会の論文
- 2001-05-15
著者
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Fukumoto Yoshiyuki
Department Of Applied Physics Graduate School Of Engineering Tohoku University
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Fukumoto Yoshiyuki
Department Of Physics Faculty Of Science And Technology Science University Of Tokyo
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