期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 78, 期 10, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.78.104706
关键词
quantum critical point; first-order valence transition; valence fluctuations; CeIrIn5; CeRhIn5; YbInCu4; YbAgCu4; YbCdCu4
资金
- Ministry of Education, Culture, Sports, Science, and Technology, Japan [18740191]
- Japan Society for the Promotion of Science (JSPS) [19340099]
- Grants-in-Aid for Scientific Research [21740240, 18740191, 19340099] Funding Source: KAKEN
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 (y = Ir, Rh) and metamagnetic transition in YbXCu4 for X = In as well as the sharp contrast between X = Ag and Cd.
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