Violation of the Zeroth Law of Thermodynamics in Systems with Negative Specific Heat

Details Violation of the Zeroth Law of Thermodynamics in Systems with Negative Specific Heat Violation of the Zeroth Law of Thermodynamics in Systems with Negative Specific Heat

2008-02-13

arxiv.org/abs/0802.1748v2

Physics

Condensed Matter

Statistical Mechanics

Physical Review Letters, 100, 120601 (2008)

Scientific paper

10.1103/PhysRevLett.100.120601

We show that systems with negative specific heat can violate the zeroth law of thermodynamics. By both numerical simulations and by using exact expressions for free energy and microcanonical entropy it is shown that if two systems with the same intensive parameters but with negative specific heat are thermally coupled, they undergo a process in which the total entropy increases irreversibly. The final equilibrium is such that two phases appear, that is, the subsystems have different magnetizations and internal energies at temperatures which are equal in both systems, but that can be different from the initial temperature.

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