Thermodynamics of the anisotropic two-channel Kondo problem

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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 h → 0 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. Finite magnetic field, h>0 drives the system to a Fermi liquid fixed point with an unusual Wilson ratio which depends sensitively on h.