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The document discusses the free energy of a ferromagnet in the Ising model. It presents the Hamiltonian, internal energy, and mean-field approximation for the model. It then derives an expression for the entropy and Helmholtz free energy in terms of the order parameter. By taking the first and second derivatives of the free energy, it obtains the Curie-Weiss equation relating the order parameter to temperature and derives conditions for a minimum versus a maximum of the free energy as a function of temperat

Author

Anderson Garcia Poveda

Language

EN