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Propriedades Termodinâmicas do Modelo de Hubbard Unidimensional no Limite Uniforme

2005; Associação Sergipana de Ciências; Volume: 1; Issue: 1 Linguagem: Inglês

1808-2793

Francisco de Salles Almeida, Cláudio Andrade Macedo,

Organic and Molecular Conductors Research

In order to contribute to understand well the thermodynamic properties of strongly correlated electron systems, we study numerically, in the grand canonical ensemble, the temperature dependence of the internal energy, specific heat, entropy, magnetization, and magnetic susceptibility of the one-dimensional Hubbard model without transference of moment in the interactions. The results have been obtained for a wide range of values of the on-site Coulombian repulsion U and of the external magnetic field h. Differences between this model and the original Hubbard model have been observed in relation to the number of peaks of the specific heat and to the behavior of the susceptibility in temperatures tending to zero. These differences evidence that the two models possess different magnetic structures of correlation.