Geodesic
Feromagnetism in~the single-band Hubbard model in~the limit of~strong correlations
Teoretičeskaâ i matematičeskaâ fizika, Tome 81 (1989) no. 3, pp. 434-440

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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. 
@article{TMF_1989_81_3_a7,
     author = {B. M. Letfulov},
     title = {Feromagnetism in~the single-band {Hubbard} model in~the limit of~strong correlations},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {434--440},
     publisher = {mathdoc},
     volume = {81},
     number = {3},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1989_81_3_a7/}
}
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B. M. Letfulov. Feromagnetism in~the single-band Hubbard model in~the limit of~strong correlations. Teoretičeskaâ i matematičeskaâ fizika, Tome 81 (1989) no. 3, pp. 434-440. http://geodesic.mathdoc.fr/item/TMF_1989_81_3_a7/