Single Impurity Anderson Model with Coulomb Repulsion between Conduction Electrons on the Nearest-Neighbour Ligand Orbital

概要

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XX7e sttrdy hoxv the Kondo effect is afl'ected by the COLIIOIIII) interaction between conductionelectrons on the basis of a siuaaplified raaodel. The single iuaaptrrity Ar'uderson naodel is extended toinclude the Cotrlounb inter?tction on the nearest-neighbotnr ligand orbital. The excitation spectraare caJctulated tzsing the ntrzaaerical renorttaaliz?rtion grotzp ta?ethod, Tlae efl'ective bandwidth onthe ligand orbital, D", is defined to classif'y the state. This qtrantity decreases as the Coulombinteraction increases. In tl'te D" >A region, the low energy properties are described by theKondo state, xvhere M is tlae hybridization width. As D" decreases in this region, the Koradotennperatxrre Ty is enlaarnced, ?tnd its naagnittrde becornes cornparable to A for D" x A. In theD"< 2 region, the local singlet state betxveen the electrons on the f and ligand orbitals isformed.
社団法人日本物理学会の論文
1998-06-15