Geodesic
The ground state of a weakly doped narrow-band Hubbard magnet
Teoretičeskaâ i matematičeskaâ fizika, Tome 105 (1995) no. 2, pp. 311-323

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The thermodynamics of a low-doped narrow-band Hubbard magnetic material is described in the framework of a consistent perturbation theory using the diagram technique of the $t$–$J$ model. Possible magnetic structures are investigated. Up to the linear approximation in the hole concentration, it is shown that the ground state of the electrons is ferromagnetic. 
@article{TMF_1995_105_2_a9,
     author = {E. E. Zubov},
     title = {The ground state of a weakly doped narrow-band {Hubbard} magnet},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {311--323},
     publisher = {mathdoc},
     volume = {105},
     number = {2},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1995_105_2_a9/}
}
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E. E. Zubov. The ground state of a weakly doped narrow-band Hubbard magnet. Teoretičeskaâ i matematičeskaâ fizika, Tome 105 (1995) no. 2, pp. 311-323. http://geodesic.mathdoc.fr/item/TMF_1995_105_2_a9/