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Quantum Monte Carlo calculation for spin systems in antiferromagnetic Heisenberg chains and ladders

Toshihiko Suzuki, Yuichi Watabe, Hitoshi Takeuchi, Yuhei Natsume, 鈴木 敏彦, 渡部 裕一, 竹内 均, 夏目 雄平

Published Jan 1, 1998• 0 citations
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Quantum Monte Carlo Calculation for Spin Systems in Two-Leg Ladders with Alternating Heisenberg-Bond Chains

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Thermodynamic properties of spin=1/2 two-leg ladders with alternating chains including ferromagnetic and antiferromagnetic interactions are discussed on the basis of the numerical results obtained by quantum Monte Carlo simulations. As well as the role of exchange interaction of rungs, the essential role of the bond alternation in the chain on ladder systems is investigated in connection with the appearance of characteristic properties in magnetic susceptibilities and heat capacities. Furthermore, quantum effects on the ground-state energy are obtained. On the basis of calculated results, the relationship between singlet dimer phases and Haldane states is discussed.

Journal of the Physical Society of Japan•Jun 15, 1997•0 citations
Thermodynamic properties of spin=1/2 two-leg ladders with alternating chains including ferromagnetic and antiferromagnetic interactions are discussed on the basis of the numerical results obtained by quantum Monte Carlo simulations. As well as the role of exchange interaction of rungs, the essential role of the bond alternation in the chain on ladder systems is investigated in connection with the appearance of characteristic properties in magnetic susceptibilities and heat capacities. Furthermore, quantum effects on the ground-state energy are obtained. On the basis of calculated results, the relationship between singlet dimer phases and Haldane states is discussed.