Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-04-22
J. Phys. Soc. Jpn., 73, 1864 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 10 figures
Scientific paper
10.1143/JPSJ.73.1864
We investigate a multi-orbital extension of the periodic Anderson model with particular emphasis on electron correlations including orbital fluctuations. By means of a linearized version of the dynamical mean-field theory, we compute the renormalization factor, the density of states, the spectral gap and the local correlation functions for a given set of the intra- and inter-orbital Coulomb interactions as well as the Hund coupling. It is found that when a certain condition is met for the intra- and inter-orbital interactions for $f$ electrons, orbital fluctuations are enhanced, thereby enlarging the Kondo insulating gap. This effect is suppressed in the presence of the Hund coupling. We also clarify how the Kondo insulator is continuously changed to the Mott insulator when electron correlations among conduction electrons are increased.
Kawakami Norio
Koga Akihisa
Ohashi Takuma
Sato Ryota
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