Evidence for magnetic field-tuned quantum criticality below $H_{c2}$ in CeCoIn$_5$

ORAL

Abstract

The existence of a magnetic field-tuned quantum critical point coinciding with the upper critical field for superconductivity in the heavy-fermion superconductor CeCoIn$_5$ has remained a puzzling fact, and has proven difficult to study due to the onset of superconductivity. Here we present low temperature thermal conductivity measurements which probe the approach to the quantum critical point in CeCoIn$_5$ as a function of field from within the superconducting state, revealing new evidence for field- tuned quantum criticality.

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Authors

  • J. Paglione

    University of Maryland, Center for Nanophysics and Advanced Materials, University of Maryland, Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland

  • J.-P. Reid

    D\'epartement de physique, Universit\'e de Sherbrooke

  • M.A. Tanatar

    Ames Laboratory

  • L. Taillefer

    D\'epartement de physique, Universit\'e de Sherbrooke

  • C. Petrovic

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Brookhaven National Laboratory, Brookhaven Natl. Lab., NY, USA, Condensed Matter Physics, Brookhaven National Laboratory