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Universal signatures of the metamagnetic quantum critical endpoint: Application to CeRu2Si2

Franziska Weickert, Manuel Brando, Frank Steglich, Philipp Gegenwart, and Markus Garst
Phys. Rev. B 81, 134438 – Published 30 April 2010

Abstract

A quantum critical endpoint related to a metamagnetic transition causes distinct signatures in the thermodynamic quantities of a compound. We argue that, irrespective of the microscopic details of the considered material, the diverging differential susceptibility combined with the Ising symmetry of the endpoint give rise to a number of characteristic metamagnetic phenomena. In the presence of a magnetoelastic coupling, one finds a correspondence of susceptibility, magnetostriction, and compressibility and, as a result, a pronounced crystal softening, a diverging Grüneisen parameter, a sign change of thermal expansion α(H), and a minimum in the specific-heat coefficient γ(H). We illustrate these signatures and their relation on the metamagnetic crossover at 8 T in the prototypical heavy-fermion system CeRu2Si2.

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  • Received 9 February 2010

DOI:https://doi.org/10.1103/PhysRevB.81.134438

©2010 American Physical Society

Authors & Affiliations

Franziska Weickert, Manuel Brando, and Frank Steglich

  • Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany

Philipp Gegenwart

  • I. Physikalisches Institut, Georg-August-Universität Göttingen, 37077 Göttingen, Germany

Markus Garst

  • Institut für Theoretische Physik, Universität zu Köln, 50938 Köln, Germany and Physik Department, Technische Universität München, 85748 Garching, Germany.

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Vol. 81, Iss. 13 — 1 April 2010

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