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Phys. Rev. B 65, 134416 (2002) [9 pages]

Thermodynamics of the anisotropic two-channel Kondo problem

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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

Received 10 October 2001; published 19 March 2002

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 h⃗0 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.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.65.134416
DOI:
10.1103/PhysRevB.65.134416
PACS:
75.20.Hr, 71.10.Hf, 71.27.+a, 72.15.Qm
 
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