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We consider the Hubbard model for electron correlations in solids in the narrow-band regime where the intra-atomic Coulomb repulsion is large compared to the bandwidth. A high-temperature pertubation expansion in the bandwidth is performed to lowest order for the grand partition function. This procedure is carried out both for one-dimensional systems, of interest for the tetracyanoquinodimethan (TCNQ) charge-transfer salts, and for a three-dimensional cubic lattice. Both the specific heat and magnetic susceptibility are computed as functions of temperature and electron density.
Physical Review B – American Physical Society (APS)
Published: Oct 1, 1973
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