Abstract
The specific heat of finite dimensional (two- and three-dimentional) ±J Ising models and infinite-range Ising spin glass (Sherrington-Kirkpatrick (SK) model) has been investigated by Monte Carlo simulations from a new point of view. The region where a part of the specific heat takes a negative value has been investigated, which is characteristic of frustrated systems and reflects the non-trivial degeneracy of the ground state. For each model, the region mentioned above is found to be fairly large in the corresponding phase diagram, which includes the Nishimori line.
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