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- W1744265162 abstract "This paper is a brief review of our recent studies concerning on magnetism and electronic states of lattice systems with Hund coupling. First we examined the effectiveness of the Hund coupling in realizing ferromagnetism in the doubly degenerate Hubbard model. One- and infinite-dimensional systems were studied and thereby dimensional dependence was discussed. In quarter-filled systems the insulating ferromagnetic state accompanied by alternating orbital order was found stable. In more-than-quarter filling cases metallic ferromagnetism is stabilized by the ``double exchange mechanism''. These results are common to one and infinite dimensions. In less-than-quarter filling cases the ferromagnetic ground state is stable in one dimension but not in infinite dimensions. Secondly we examined the electronic states and the resistivity in the double exchange model by using the one-particle Green function. The splitting and narrowing of the one-particle spectrum due to the Hund coupling were clarified in the framework of a single-site approximation. The resistivity due to the scattering by random localized spins was shown to be too small to explain the experimental results of doped manganites." @default.
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- W1744265162 date "1998-11-19" @default.
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- W1744265162 title "Magnetism and Electronic States of Systems with Strong Hund Coupling" @default.
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