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High-temperature expansion for the single-band Hubbard model

1992; American Physical Society; Volume: 46; Issue: 10 Linguagem: Inglês

10.1103/physrevb.46.6328

1095-3795

Jon Henderson, J. Oitmaa, M. C. B. Ashley,

Quantum and electron transport phenomena

We study the single-band Hubbard model via high-temperature expansions to order (\ensuremath{\beta}t${)}^{9}$ for the standard two- and three-dimensional lattices. Series are derived for the grand potential and for the ferromagnetic susceptibility, for general values of the Coulomb repulsion parameter U and electron density n. The series are difficult to analyze with any degree of precision, but estimates are obtained for the ferromagnetic critical temperature.