Magnetic Field Effect in an Extended Periodic Anderson Model with Dynamical Mean-Field Theory
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概要
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We investigate effect of an external magnetic field $h$ in an extended periodic Anderson model, which includes the repulsion $U_{cf}$ between $ f$ and conduction electron in a usual periodic Anderson model. We treat the model with dynamical mean-field theory using an exact diagonalization method. Applying a magnetic field, the first-order valence transition (FOVT) occurs at the smaller $U_{cf}$ and shallower $ f$-electron level $\epsilon_{f}$, at which a jump of the magnetization $m$ occurs simultaneously. The position of the quantum critical point (QCP) of the FOVT is shifted to the region of the smaller $U_{cf}$ and shallower $\epsilon_{f}$ level as $h$ increases. For large $h$ the position of the QCP does not changed in the ($\epsilon_{f} - h/2$)–$U_{cf}$ plane.
- 2010-12-15
著者
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Sugibayashi Takashi
Department Of Physics Nagoya University
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Tsuruta Atsushi
Division of Materials Physics, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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Tsuruta Atsushi
Division of Materials Physics, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531
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Sugibayashi Takashi
Department of Physics, Ehime University, Matsuyama 790-8577, Japan
関連論文
- 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)
- Charge Fluctuations and Superconductivity in an Extended Periodic Anderson Model: A Weak Coupling Theory(Condensed matter: electronic structure and electric, magnetic, and optical properties)
- Magnetic Field Effect in an Extended Periodic Anderson Model with Dynamical Mean-Field Theory
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- Valence Fluctuations Revealed by Magnetic Field and Pressure Scans: Comparison with Experiments in YbXCu4 ($\text{X}=\text{In}$, Ag, Cd) and CeYIn5 ($\text{Y}=\text{Ir}$, Rh)