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Specific heat of the driven Curie-Weiss model
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Applying a time-periodic magnetic field to the standard ferromagnetic Curie-Weiss model brings the spin system in a steady out-of-equilibrium condition. We recall how the hysteresis gets influenced by the amplitude and the frequency of that field, and how an amplitude- and frequency-dependent (dynamical) critical temperature can be discerned. The dissipated power measures the area of the hysteresis loop and changes with temperature. The excess heat determines a nonequilibrium specific heat giving the quasistatic response. We compute that specific heat, which appears to diverge at the critical temperature, quite different from the equilibrium case.
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Critical heat current fluctuations in Curie-Weiss model in and out of equilibrium
At the Curie-Weiss temperature-driven transition, heat current noise diverges with system size, while at the field-driven transition it diverges only near, not at, the transition point.
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