Phase transitions in the steady-state behavior of mechanically perturbed spin glasses and ferromagnets

Article

关键词: RANDOM THIN GRAPHS;    METASTABLE STATES;    EDWARDS MEASURES;    MODEL;    MIXTURES;    POWDERS;   

DOI  :  10.1103/PhysRevB.65.220403

来源: SCIE

【 摘 要 】

We analyze the steady-state regime of systems, interpolating between spin glasses and ferromagnets under a tapping dynamics recently introduced by analogy with the dynamics of mechanically perturbed granular media. A crossover from a second-order to first-order ferromagnetic transition as a function of the spin coupling distribution is found. The flat measure over blocked states introduced by Edwards for granular media is used to explain this scenario. Annealed calculations of the Edwards entropy are shown to qualitatively explain the nature of the phase transitions. A Monte Carlo construction of the Edwards measure confirms that this explanation is also quantitatively accurate.

【 授权许可】

Free