|Título||Phase transitions in the three-state Ising spin-glass model with finite connectivity
Erichsen Junior, Rubem
Theumann, Walter Karl
|Abstract||The statistical mechanics of a two-state Ising spin-glass model with finite random connectivity, in which each site is connected to a finite number of other sites, is extended in this work within the replica technique to study the phase transitions in the three-state Ghatak-Sherrington (or random Blume-Capel) model of a spin glass with a crystal-field term. The replica symmetry ansatz for the order function is expressed in terms of a two-dimensional effective-field distribution, which is determined numerically by means of a population dynamics procedure. Phase diagrams are obtained exhibiting phase boundaries that have a reentrance with both a continuous and a genuine first-order transition with a discontinuity in the entropy. This may be seen as “inverse freezing,” which has been studied extensively lately, as a process either with or without exchange of latent heat.
|Contido em||Physical review. E, Statistical, nonlinear, and soft matter physics. Vol. 83, no. 6 (June 2011), 061126, 7 p.
Diagramas de fase
Interacoes de campo cristalino
Modelo de ising
Vidros de spin
|Tipo||Artigo de periódico
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