Magnetization Process in the Shastry-Sutherland System SrCu_2(BO_3)_2: Results of Third-Order Dimer Expansion : Condensed Matter: Electronic Properties, etc.
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概要
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The magnetization process in the Shastry-Sutherland system is studied by using the third-order perturbation expansion. It is shown that the 1/3-plateau is realized by the second-order perturbation, which is not prevented by the off-diagonal part. In each subspace whose magnetization per dimer is less than 1/3, the lowest energy state is determined by a small but finite energy-gain due to the third-order correlated flip terms and there exists no plateau originating from the third-order effect. Our results are compared with those of the exact diagonalization method to discuss the validity of truncation of states in our perturbation theory.
- 社団法人日本物理学会の論文
- 2000-05-15
著者
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Oguchi Akihide
Department Of Physics Faculty Of Science And Technology Science University
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Fukumoto Yoshiyuki
Department Of Applied Physics Graduate School Of Engineering Tohoku University
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