Valence Instability and the Quantum Critical Point in an Extended Periodic Anderson Model : Analysis Based on the Dynamical Mean Field Theory(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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The dynamical mean field theory combined with exact diagonalization is used to study the valence instability in an extended periodic Anderson model. It is found that at fixed total electron number, the f-electron number is rapidly decreased against the f-electron level ε^<(0)>_f in the presence of the repulsive interaction U_<cf> between a conduction electron and an f electron, This implies the enhancement of valence fluctuations due to U_<cf>. In addition, a first-order valence transition is likely to occur, provided the c-f mixing is small and U_<cf> is large enough to be comparable to the band width of conduction electrons. The quantum critical point of valence transition is identified in the ε^<(0)>_f -U_<cf> plane. Implications for the valence fluctuations of the related Ce compounds are also discussed.
- 社団法人日本物理学会の論文
- 2008-11-15
著者
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SAIGA Yasuhiro
Department of Mathematics and Statistics, University of Melbourne
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Saiga Yasuhiro
Department Of Physics Nagoya University
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HIRASHIMA Dai
Department of Physics, Nagoya University
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Hirashima Dai
Department Of Physics Nagoya University
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SUGIBAYASHI Takashi
Department of Physics, Nagoya University
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Sugibayashi Takashi
Department Of Physics Nagoya University
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Saiga Yasuhiro
Department of Physics, Nagoya University
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Hirashima Dai
Department of Material Science, International Christian University, Mitaka, Tokyo 181-8585, Japan
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