This article is cited in 1 paper

Feromagnetism in the single-band Hubbard model in the limit of strong correlations

B. M. Letfulov


Abstract: A thermodynamic potential of the single-band strong correlation Hubbard model is calculated by means of diagram technique in a two-loop approximation. Some features of diagram technique for Hubbard $X$-operators are discussed. It is shown that, in the case of almost half-filled band, the system tends to be paramagnetically unstable. The dependence of extrapolation Curie temperatures on hole concentration is given.

Received: 27.04.1988

 English version: Theoretical and Mathematical Physics, 1989, 81:3, 1314–1319

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