Ordered Phases and Phase Transitions in The Stacked Triangular Antiferromagnet CsCoCl_3 and CsCoBr_3 (Condensed Matter : Structure, Mechanical and Thermal Properties)
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概要
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We study the ordered phases and the phase transitions in the stacked triangular antiferromagnetic Ising (STAFI) model with strong interplane coupling modeling CsCoCl_3 and CsCoBr_3. We find that there exists an intermediate phase which consists of a single phase of so-called partial disordered (PD) type, and confirm the stability of this phase. The low temperature phase of this model is so-called two-sublattice ferri magnetic phase. The phase transition between the PD phase and two-sublattice ferri magnetic phase is of the first order. This sequence of the phases is homomorphic as that in the three-dimensional generalized six-state clock model which have the same symmetry of the STAFI model. By studying distributions of domain walls in one dimensional chains connecting layered triangular lattices, we clarify the nature of the phase transition and give an interpretation of little anomaly of the specific heat.
- 社団法人日本物理学会の論文
- 2004-02-15
著者
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MIYASHITA Seiji
Department of Applied Physics, Graduate School of Engineering, The University of Tokyo
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Todoroki Norikazu
Department Of Applied Physics University Of Tokyo
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Miyashita Seiji
Department Of Applied Physics Graduate School Of Engineering The University Of Tokyo
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