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Estimating the Hubbard repulsion sufficient for the onset of nearly-flat-band ferromagnetism
Hubbard repulsion sufficient onset of nearly-flat-band ferromagnetism
2011/3/2
We consider nearly-flat-band Hubbard models of a ferromagnet, that is the models that are weak perturbations of those flat-band Hubbard models whose ground state is ferromagnetic for any nonzero stren...