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Quantum Monte Carlo simulation for magnetic properties in spin systems in chain and ladders: Magnetic Raman spectra by the exchange scattering in the antiferromagnetic ladder with two-legs

Toshihiko Suzuki, Yuhei Natsume, 鈴木 敏彦, 夏目 雄平

Published Jan 1, 1999• 0 citations
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Progress of Theoretical Physics Supplement•Jan 1, 2000•2 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.