Absence of Hybridization Gap in Heavy Electron Systems and Analysis of YbAl_3 in Terms of Nearly Free Electron Conduction Band(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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In the analysis of the heavy electron systems, theoretical models with c-f hybridization gap are often used. We point out that such a gap does not exist and the simple picture with the hybridization gap is misleading in the metallic systems, and present a correct picture by explicitly constructing an effective band model of YbAl_3. Hamiltonian consists of a nearly free electron model for conduction bands which hybridize with localized f-electrons, and includes only a few parameters. Density of states, Sommerfeld coefficient, f-electron number and optical conductivity are calculated and compared with the band calculations and the experiments.
社団法人日本物理学会の論文
2007-12-15