Origin of mean-field behavior in an elastic Ising model

Article

关键词: SPIN COMPLEX-MOLECULES;    MONTE-CARLO;    CROSSOVER SOLIDS;    PHASE-SEPARATION;    DYNAMICAL MODEL;    TRANSITION;    PRESSURE;    LIGHT;   

DOI  :  10.1103/PhysRevB.102.024102

来源: SCIE

【 摘 要 】

Simple elastic models of spin-crossover compounds are known empirically to exhibit classical critical behavior. We demonstrate how the long-range interactions responsible for this behavior arise naturally upon integrating out mechanical fluctuations of such a model. A mean-field theory applied to the resulting effective Hamiltonian quantitatively accounts for both thermodynamics and kinetics observed in computer simulations, including a barrier to magnetization reversal that grows extensively with system size. For nanocrystals, which break translational symmetry, a straightforward extension of mean-field theory yields similarly accurate results.

【 授权许可】

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