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- W2078509920 abstract "Two mechanisms of the Curie-Weiss law for itinerant-electron ferromagnets are examined by the $1/d$ expansion theory, with d being the spatial dimensionality. One is the temperature dependence of a novel exchange interaction, which is caused by the virtual exchange of pair excitations of quasiparticles in spin channels. It corresponds to that of Weiss' magnetic mean fields, and it is of leading order in $1/d.$ The other is that of the mode-mode coupling between intersite spin fluctuations, and it is of higher order in $1/d.$ When the density of states is almost constant around the Fermi level, the mode-mode coupling is responsible for the Curie-Weiss law as it is in Murata and Doniach's theory or the so-called self-consistent renormalization theory. When the Fermi level is in the vicinity of a sharp peak in the density of states for quasiparticles, on the other hand, Weiss' magnetic mean fields are responsible for the Curie-Weiss law; the mode-mode coupling suppresses the Curie-Weiss law. Unless $Tensuremath{ll}{T}_{K},$ with ${T}_{K}$ being the Kondo temperature, local thermal spin fluctuations, which are of leading order in $1/d,$ also contribute to the Curie-Weiss law." @default.
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- W2078509920 date "2000-01-01" @default.
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- W2078509920 title "Curie-Weiss law for almost localized itinerant-electron ferromagnets" @default.
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- W2078509920 doi "https://doi.org/10.1103/physrevb.61.1357" @default.
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