Pressure studies of the quantum critical alloy Ce0.93Yb0.07CoIn5

Y. P. Singh, D. J. Haney, X. Y. Huang, B. D. White, M. B. Maple, M. Dzero, and C. C. Almasan
Phys. Rev. B 91, 174506 – Published 11 May 2015

Abstract

Here we present our experimental and theoretical study of the effects of pressure on the transport properties of the heavy-fermion alloy Ce1xYbxCoIn5 with actual concentration x0.07. We specifically choose this value of ytterbium concentration because the magnetic-field-induced quantum critical point, which separates the antiferromagnetic and paramagnetic states at zero temperature, approaches zero, as has been established in previous studies. Our measurements show that pressure further suppresses quantum fluctuations in this alloy, just as it does in the parent compound CeCoIn5. In contrast, the square-root temperature-dependent part of resistivity remains insensitive to pressure, indicating that the heavy quasiparticles are not involved in the inelastic scattering processes leading to such a temperature-dependent resistivity. We demonstrate that the growth of the coherence temperature with pressure, as well as the decrease of the residual resistivity, can be accurately described by employing the coherent potential approximation for a disordered Kondo lattice.

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  • Received 19 November 2014
  • Revised 22 April 2015

DOI:https://doi.org/10.1103/PhysRevB.91.174506

©2015 American Physical Society

Authors & Affiliations

Y. P. Singh1,*, D. J. Haney1,*, X. Y. Huang1, B. D. White2, M. B. Maple2, M. Dzero1, and C. C. Almasan1

  • 1Department of Physics, Kent State University, Kent, Ohio 44242, USA
  • 2Department of Physics, University of California at San Diego, La Jolla, California 92903, USA

  • *These authors have contributed equally to this work.

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Vol. 91, Iss. 17 — 1 May 2015

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