Field-Induced Quantum Critical Point in CeCoIn5

Phys. Rev. Lett. 91, 246405 – Published 12 December 2003
Johnpierre Paglione, M. A. Tanatar, D. G. Hawthorn, Etienne Boaknin, R. W. Hill, F. Ronning, M. Sutherland, Louis Taillefer, C. Petrovic, and P. C. Canfield

Abstract

The resistivity of the heavy-fermion superconductor CeCoIn5 was measured as a function of temperature, down to 25 mK and in magnetic fields of up to 16 T applied perpendicular to the basal plane. With increasing field, we observe a suppression of the non-Fermi liquid behavior, ρT, and the development of a Fermi liquid state, with its characteristic ρ=ρ0+AT2 dependence. The field dependence of the T2 coefficient shows critical behavior with an exponent of 1.37. This is evidence for a field-induced quantum critical point (QCP), occurring at a critical field which coincides, within experimental accuracy, with the superconducting critical field Hc2. We discuss the relation of this field-tuned QCP to a change in the magnetic state, seen as a change in magnetoresistance from positive to negative, at a crossover line that has a common border with the superconducting region below 1K.

DOI: http://dx.doi.org/10.1103/PhysRevLett.91.246405

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  • Received 19 December 2002
  • Published 12 December 2003

© 2003 The American Physical Society

Authors & Affiliations

Johnpierre Paglione*, M. A. Tanatar, D. G. Hawthorn, Etienne Boaknin, R. W. Hill, F. Ronning, M. Sutherland, and Louis Taillefer

  • Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7

C. Petrovic§ and P. C. Canfield

  • Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

  • *Electronic address: paglione@physics.utoronto.ca
  • Permanent address: Institute of Surface Chemistry, N.A.S. Ukraine, Kyiv, Ukraine.
  • Current address: Département de Physique, Université de Sherbrooke, Sherbrooke, Canada J1K 2R1.
  • §Current address: Department of Physics, Brookhaven National Laboratory, Upton, NY 11973, USA.

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