Absence of dipole glass transition for randomly dilute classical Ising dipoles

Article

关键词: QUANTUM STATE;    SPIN-GLASSES;    SYSTEMS;    FERROELECTRICITY;    DEFECTS;    SOLIDS;    MODELS;    LIHOF4;   

DOI  :  10.1103/PhysRevB.72.214203

来源: SCIE

【 摘 要 】

Dilute dipolar systems in three dimensions are expected to undergo a spin glass transition as the temperature decreases. Contrary to this, we find from Wang-Landau Monte Carlo simulations that at low concentrations x, dipoles randomly placed on a cubic lattice with dipolar interactions do not undergo a phase transition. We find that in the thermodynamic limit the glass transition temperature T-g goes to zero as 1/root N, where N is the number of dipoles. The entropy per particle at low temperatures is larger for lower concentrations (x=4.5%) than for higher concentrations (x=20%).

【 授权许可】

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