Ferromagnetism in the Hubbard models with degenerate single-electron ground states.
作者： Hal Tasaki
DOI: 10.1103/PHYSREVLETT.69.1608
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摘要: We study a class of Hubbard models in which the corresponding single-electron ground states have bulk degeneracy. prove that exhibit ferromagnetism when electron filling factor is not more than and sufficiently close to ρ 0 =|V|/2|Λ| (where |V| dimension degeneracy |Λ| number sites), paramagnetism small. This first time three-dimensional itinerant-electron system proved finite range
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