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We consider the two-channel Kondo model in the Emery-Kivelson approach, and calculate the total susceptibility enhancement due to the impurity ₈₌=-₁ₔ₋₊. We find that ₈₌ exactly vanishes at the solvable point, in a completely analogous way to the singular part of the specific heat C₈₌. A perturbative calculation around the solvable point yields the generic behavior ₈₌ (1/T), C₈₌ logT and the known universal value of the Wilson ratio Rₖ=8/3. From this calculation, the Kondo temperature can be identified and is found to behave as the inverse square of the perturbation parameter. The small-field, zero-temperature behavior ₈₌ (1/h) is also recovered.
Sengupta et al. (Fri,) studied this question.
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