Quantum Monte Carlo Calculation for Spin Systems in Two-Leg Ladders with Alternating Heisenberg-Bond Chains.

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  • Momose Takafumi
    Department of Physics, Faculty of Science, Chiba University, Yayoi–cho, Inage–ku, Chiba 263
  • Suzuki Toshihiko
    Department of Physics, Faculty of Science, Chiba University, Yayoi–cho, Inage–ku, Chiba 263
  • Natsume Yuhei
    Department of Physics, Faculty of Science, Chiba University, Yayoi–cho, Inage–ku, Chiba 263

Bibliographic Information

Other Title
  • Quantum Monte Carlo Calculation for Spi
Published
1997
DOI
  • 10.1143/jpsj.66.1618
Publisher
THE PHYSICAL SOCIETY OF JAPAN

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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.

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