Local Kondo Temperature of Strongly Correlated Electron Liquids

概要

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The Hubbard model is studied for its paramagnetic phase. The leading-ordereffects in 1 /d are Kondo-effect-tyj>e local spin fluctuations, with d being the spatialdimensionality. For d-+ -F- cX), a "local" Kondo tem)cerature is defined to show anenergy scale of the lo<:al spin fluctuations or the strength of tlte Kondo effect toquench magnetic moments. Even for finite cl, the local Kondo temperature is stillunambiguously defined through the mapping to the Anderson model. It is so renor-ma[ized as to increase by intersite and critical spin fluctuations, which are of higherorder in 1 /cl. The rerrc>rmalization of the local Konclo temperature can play crucialroles in the suppression of magnetism, the occurrence of high-temperature supercon-ductivity, and the occturrence of metamagnetism in the presence of magnetic fields.The above results generally apply to strongly correlated electron liquids.[Hubbarddimensions, ]l 1Ifluctua- lj lions,Ilmodel, Anderson model, electron correlation, infinute/ d expansuon, Kondo effect, Kondo temperature, renormalization, SPIIIhigh T , sup?crconductivity, magnetism, metamagnetxsm
社団法人日本物理学会の論文
1992-12-15