Thermodynamics of the anisotropic two-channel Kondo problem

Gergely Zaránd, Theo Costi, Andres Jerez, and Natan Andrei
Phys. Rev. B 65, 134416 – Published 19 March 2002
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Abstract

We construct and solve numerically the thermodynamic Bethe-ansatz equations for the spin-anisotropic two-channel Kondo model in arbitrary external field h. At high temperatures the specific heat and the susceptibility show power-law dependence. For h0 and at temperatures below the Kondo temperature TK a two-channel Kondo effect develops characterized by a Wilson ratio 8/3, and a logarithmic divergence of the susceptibility and the linear specific-heat coefficient. A finite magnetic field, h>0, drives the system to a Fermi-liquid fixed point with an unusual Wilson ratio which depends sensitively on h.

  • Received 10 October 2001

DOI:https://doi.org/10.1103/PhysRevB.65.134416

©2002 American Physical Society

Authors & Affiliations

Gergely Zaránd1,2, Theo Costi3,4, Andres Jerez3,5, and Natan Andrei6

  • 1Lyman Physics Laboratory, Harvard University, Cambridge, Massachusetts 02138
  • 2Research Group of the Hungarian Academy of Sciences, Institute of Physics, TU Budapest, H-1521 Hungary
  • 3Institut Laue–Langevin, 6 rue Jules Horowitz, B.P. 156, 38042 Grenoble Cedex 9, France
  • 4Institut für Theorie der Kondensierten Materie, Universität Karlsruhe (TH), D-76128 Karlsruhe, Germany
  • 5European Synchrotron Radiation Facility, B.P. 220, 38042 Grenoble Cedex, France
  • 6Center of Materials Theory, Rutgers University, Piscataway, New Jersey 08854-0849

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Issue

Vol. 65, Iss. 13 — 1 April 2002

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