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Recently, Jones, Varma, and Wilkins 1 found a novel type of fixed point of the two-impurity Kondo model using Wilson's numerical renormalization-group technique. The problem involves two energy scales: the single-ion Kondo temperature TK and the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction energy /. There are two stable fixed points 2 : (a) For JI TK> 2,2 the ground state is the antiferromagnetic singlet (no Kondo effect) and (b) for J/T K < 2.2 the impurity spins are

The authors calculate the ground state susceptibility chi 0, to leading and next-leading order in a 1/n expansion, for the N-fold degenerate Anderson model in the integral valent limit. From this and perturbational results they are able to calculate the Wilson numbers W(N), which relate to chi 0 and TK, to first order in 1/N.