Phase transition of Two-timescale Two-temperature Spin-lattice Gas Model

Details Phase transition of Two-timescale Two-temperature Spin-lattice Gas Model Phase transition of Two-timescale Two-temperature Spin-lattice Gas Model

2008-07-29

arxiv.org/abs/0807.4601v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

8 pages, 6 figures

Scientific paper

We study phase transition of a nonequilibrium statistical-mechanical model, in which two degrees of freedom with different time scales separated from each other touch to their own heat bath. A general condition for finding anomalous negative latent heat recently discovered is derived a from thermodynamic argument. As a specific example, phase diagram of a spin-lattice gas model is studied based on a mean-field analysis with replica method. While configurational variables are spin and particle in this model, it is found that the negative latent heat appears in a parameter region of the model, irrespective of the order of their time scale. Qualitative differences in the phase diagram are also discussed.

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