Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-07-23
J. Phys. Soc. Jpn. 76 (2007) 124704
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 9 figures, submitted to J. Phys. Soc. Jpn
Scientific paper
10.1143/JPSJ.76.124704
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.
Imai Yoshiki
Kuroiwa Hiroyuki
Saso Tetsuro
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