Effective Hamiltonian and Phase Transitions of Hexagonal Heisenberg Antiferromagnets with Easy-Axis Anisotropy
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概要
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A detailed study is made on ]-Ieisenberg antiferrornagnets on the ltexagonal lattucesuch as CsNiCl. or CsMnI., w'hich have an easy-axis anisotropy. First, an effectix'eHamiltonian is deriezed for low-energy fluctuations of local 120' spin structure. Tlaen,Monte Carlo simulations are carried out with this Flamiltonian to study in detail tlaenature of phase transitions and their critical properties. Two successive phase transi-tions are detected; estimated critical exponents for two phase transitions turn out tobe consistent with the universality class of three-dimensional XY model. A verygradual increase of uniform magnetization is also observed below the upper transi-tion temperature T... From a consideration with finite-size scaling theory, we corn-clude that only the cosine-mode is chos<:n below 7'....
- 社団法人日本物理学会の論文
- 1992-11-15
著者
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SHIBA Hiroyuki
Department of Physics, Kobe University
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Shiba Hiroyuki
Department Of Physics Tokyo Institute Of Technology
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OHYAMA Tomonobu
Department of Physics,Tokyo Institute of Technology
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Shiba Hiroyuki
Department Of Computer Science Gunma University Faculty Of Engineering
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Ohyama Tomonobu
Department Of Physics Tokyo Institute Of Technology
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