Valence Fluctuations Revealed by Magnetic Field Scan: Comparison with Experiments in YbXCu 4 X=In, Ag, Cd and CeYIn 5 Y=Ir, Rh - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




Valence Fluctuations Revealed by Magnetic Field Scan: Comparison with Experiments in YbXCu 4 X=In, Ag, Cd and CeYIn 5 Y=Ir, Rh - Condensed Matter > Strongly Correlated Electrons - Download this document for free, or read online. Document in PDF available to download.

Abstract: The mechanism of how critical end points of the first-order valencetransitions FOVT are controlled by a magnetic field is discussed. Wedemonstrate that the critical temperature is suppressed to be a quantumcritical point QCP by a magnetic field. This results explain the fielddependence of the isostructural FOVT observed in Ce metal and YbInCu 4.Magnetic field scan can lead to reenter in a critical valence fluctuationregion. Even in the intermediate-valence materials, the QCP is induced byapplying a magnetic field, at which the magnetic susceptibility also diverges.The driving force of the field-induced QCP is shown to be a cooperativephenomenon of the Zeeman effect and the Kondo effect, which creates a distinctenergy scale from the Kondo temperature. The key concept is that the closenessto the QCP of the FOVT is capital in understanding Ce- and Yb-based heavyfermions. It explains the peculiar magnetic and transport responses in CeYIn 5Y=Ir, Rh and metamagnetic transition in YbXCu 4 for X=In as well as the sharpcontrast between X=Ag and Cd.



Author: Shinji Watanabe, Atsushi Tsuruta, Kazumasa Miyake, Jacques Flouquet

Source: https://arxiv.org/



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