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For the two-impurity Kondo system, the low-temperature properties---impurity spin-spin correlation function, susceptibilities, specific heat, and Wilson ratio---are strongly nonuniversal functions of the ratio I₀{T₊} of the Ruderman-Kittel-Kasuya-Yosida coupling to the single-impurity Kondo temperature. In particular, there is a new unstable fixed point for an antiferromagnetic coupling with I₀{T₊}-2. 2. The calculations utilize a newly found symmetry of Kondo Hamiltonians, axial charge.
Jones et al. (Mon,) studied this question.
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