Valence Fluctuations Revealed by Magnetic Field and Pressure Scans: Comparison with Experiments in YbXCu<SUB>4</SUB> (X=In, Ag, Cd) and CeYIn<SUB>5</SUB> (Y=Ir, Rh)

• Watanabe Shinji

  Department of Applied Physics, University of Tokyo

• Tsuruta Atsushi

  Division of Materials Physics, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University

• Miyake Kazumasa

  Division of Materials Physics, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University

• Flouquet Jacques

  Département de la Recherche Fondamentale sur la Matière Condenseé, SPSMS, CEA Grenoble

Bibliographic Information

Other Title

• Valence fluctuations revealed by magnetic field and pressure scans: comparison with experiments in YbXCu4 (X = In, Ag, Cd) and CeYIn5 (Y = Ir, Rh)

Abstract

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.

Journal

• Journal of the Physical Society of Japan

  Journal of the Physical Society of Japan 78 (10), 104706-104706, 2009

  THE PHYSICAL SOCIETY OF JAPAN

Keywords

• quantum critical point
• first-order valence transition
• valence fluctuations
• CeIrIn<SUB>5</SUB>
• CeRhIn<SUB>5</SUB>
• YbInCu<SUB>4</SUB>
• YbAgCu<SUB>4</SUB>
• YbCdCu<SUB>4</SUB>

Details

• CRID: 1390001204197106304
• NII Article ID: 130005437123
• NII Article ID: 210000108026
• NII Article ID: 40016772360
• NII Book ID: AA00704814
• DOI: 10.1143/jpsj.78.104706
• BIBCODE: 2009JPSJ...78j4706W
• ISSN: 13474073
• ISSN: 00319015
• ISSN: http://id.crossref.org/issn/00319015
• NDL BIB ID: 10390694
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10390694
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.78.104706
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed