Blume-Emery-Griffiths model in a random crystal field

Article

关键词: LATTICE-GAS MODEL;    1ST-ORDER PHASE-TRANSITIONS;    SPACE RENORMALIZATION-GROUP;    ISING-MODEL;    MEAN-FIELD;    RANDOM BONDS;    FERROMAGNET;    SYSTEMS;    CONDENSATION;    SEPARATION;   

DOI  :  10.1103/PhysRevB.60.1033

来源: SCIE

【 摘 要 】

We study the Blume-Emery-Griffiths model in a random crystal field in two and three dimensions, through a real-space renormalization-group approach and a mean-field approximation, respectively. According to the two-dimensional renormalization-group calculation, non-symmetry-breaking first-order phase transitions are eliminated and symmetry-breaking discontinuous transitions' are replaced by continuous ones, when disorder is introduced. On the other hand, the mean-field calculation predicts that first-order transitions are not eliminated by disorder, although some changes are introduced in the phase diagrams. We make some comments on the consequences of a degeneracy parameter, which may be relevant in martensitic transitions. [S0163-1829(99)09925-7].

【 授权许可】

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