Statistical Mechanical Theory of Cooperative Phenomena.II.Super-Effective-Field Theory with Applications to Exotic Phase Transitions
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A new scheme to study exotic phase transitions is formulated by introducing theconcept of a super-effective field. A general mechanism of phase transitions iselucidated and a general criterion of order parameters is proposed on the basis of thenewly formulated super-effective-field theory. An alternative formulation based on adecoupled density matrix is also given. It is easily shown using these formulations thata quantum chiral order appears in the antiferromagnetic X Y model on the triangularlattice. A super-effective-field theory of spin glasses is also presented.
- 社団法人日本物理学会の論文
- 1988-07-15
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