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)
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概要
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The mechanism of how critical end points of the first-order valence transition (FOVT) are controlled by a magnetic field is discussed. We demonstrate that critical temperature is suppressed to be a quantum critical point (QCP) by a magnetic field. This results explain the field dependence of the isostructural FOVT observed in Ce metal and YbInCu4. Magnetic field scan can make the system reenter in a critical valence fluctuation region. Even in intermediate-valence materials, the QCP is induced by applying a magnetic field, at which magnetic susceptibility also diverges. The driving force of the field-induced QCP is shown to be a cooperative phenomenon of the Zeeman effect and the Kondo effect, which creates a distinct energy scale from the Kondo temperature. The key concept is that the closeness to the QCP of the FOVT is vital in understanding Ce- and Yb-based heavy-fermions. This explains the peculiar magnetic and transport responses in CeYIn5 ($\text{Y}=\text{Ir}$, Rh) and metamagnetic transition in YbXCu4 for $\text{X}=\text{In}$ as well as the sharp contrast between $\text{X}=\text{Ag}$ and Cd.
- 2009-10-15
著者
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Miyake Kazumasa
Division Of Endocrine Surgery Kawasaki Medical School.
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Flouquet Jacques
Departement de Recherche Fondamentale sur la Matiere Condensee
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Watanabe Shinji
Department Of Applied Physics University Of Tokyo
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Flouquet Jacques
Département de la Recherche Fondamentale sur la Matière Condenseé, SPSMS, CEA Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
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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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