Towards the Identification of a Quantum Critical Line in the (p, B) Phase Diagram of CeCoIn5 with Thermal-Expansion Measurements

S. Zaum, K. Grube, R. Schäfer, E. D. Bauer, J. D. Thompson, and H. v. Löhneysen
Phys. Rev. Lett. 106, 087003 – Published 23 February 2011

Abstract

The low-temperature thermal expansion of CeCoIn5 single crystals measured parallel and perpendicular to magnetic fields B oriented along the c axis yields the volume thermal-expansion coefficient β. Considerable deviations of β(T) from Fermi-liquid behavior occur already within the superconducting region of the (B, T) phase diagram and become maximal at the upper critical field Bc20. However, β(T) and the Grüneisen parameter Γ are incompatible with a quantum critical point at Bc20, but allow for a quantum criticality shielded by superconductivity and extending to negative pressures for B<Bc20. We construct a tentative (p, B, T) phase diagram of CeCoIn5 suggesting a quantum critical line in the (p, B) plane.

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  • Received 15 October 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.087003

© 2011 American Physical Society

Authors & Affiliations

S. Zaum1,2, K. Grube1, R. Schäfer1, E. D. Bauer3, J. D. Thompson3, and H. v. Löhneysen1,2

  • 1Institut für Festkörperphysik, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany
  • 2Physikalisches Institut, Karlsruhe Institute of Technology, D-76031 Karlsruhe, Germany
  • 3Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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Vol. 106, Iss. 8 — 25 February 2011

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