Abstract
The thermodynamic Bethe ansatz equations of the two channel spin 1 2 Kondo problem are solved numerically as a function of field and temperature and the entropy, specific heat, magnetization and susceptibility are obtained. The results are interpreted in terms of an axially distorted quadrupolar Kondo effect as introduced by Cox to explain some unusual properties of UBe 13. Here the field plays the role of the quadrupolar splitting and the magnetization represents the quadrupolar moment. The coupling to the field leads to a lattice instability and to large γ values of the specific heat.
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