Order Parameter Expansion of Free Energy and Spin-Glasses. II : Random Site Model

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概要

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• A Landau type energy for random site model, which is composed of random mixture of the two kinds of magnetic atoms A and B with m-component spins, is derived in the mean field approximation on the basis of replica method. When the exchange interactions J_<jk> are taken as J_<AA> for neighboring two A atoms, J_<AB> for meighboring A and B atoms and J_<BB> for neighboring two B atoms, it is shown that the spin-glass transition can occur for certain combination of these three interaction parameters and for suitable concentration of two magnetic atoms. The phase diagram and the specific heat with a weak singularity at spin-glass transition temperature are obtained for some illustrative examples. An analytic solution of the free energy is also given in the Appendix fot the vanishing limit of replica number n.

• 一般社団法人日本物理学会の論文
• 1980-05-25

著者

• NAMBU Shinji

  Department of Physics, Kwansei Gakuin University

• Nambu Shinji

  Department Of Physics Kwansei Gakuin University

関連論文

• Order Parameter Expansion of Free Energy and Spin-Glasses. I : Random Bond Model
• Order-Parameter Expansion of Free Energy and Its Application to Some Models with First and Second Order Phase Transitions
• Freeze-In Transition of Anharmonic Oscillator System with Quenched Random Interactions
• Stability of the Ginzburg-Landau Spin-Glass Model
• Phenomenological Cluster Theory of Spin-Glasses : Condensed Matter and Statistical Physics
• Order Parameter Expansion of Free Energy and Spin-Glasses. II : Random Site Model

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