Magnetic-Field Control of Quantum Critical Points of Valence Transition

Shinji Watanabe, Atsushi Tsuruta, Kazumasa Miyake, and Jacques Flouquet
Phys. Rev. Lett. 100, 236401 – Published 10 June 2008

Abstract

We study the mechanism of how critical end points of first-order valence transitions are controlled by a magnetic field. We show that the critical temperature is suppressed to be a quantum critical point (QCP) by a magnetic field, and unexpectedly, the QCP exhibits nonmonotonic field dependence in the ground-state phase diagram, giving rise to the emergence of metamagnetism even in the intermediate valence-crossover regime. The driving force of the field-induced QCP is clarified to be cooperative phenomena of the Zeeman and Kondo effects, which create a distinct energy scale from the Kondo temperature. This mechanism explains the peculiar magnetic response in CeIrIn5 and the metamagnetic transition in YbXCu4 for X=In as well as the sharp contrast between X=Ag and Cd.

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  • Received 15 November 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.236401

©2008 American Physical Society

Authors & Affiliations

Shinji Watanabe1, Atsushi Tsuruta2, Kazumasa Miyake2, and Jacques Flouquet3

  • 1Department of Applied Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo, 113-8656, Japan
  • 2Division of Materials Physics, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
  • 3Département de la Recherche Fondamentale sur la Matière Condenseé, SPSMS, CEA Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France

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Vol. 100, Iss. 23 — 13 June 2008

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