Abstract

A modified numerical renormalization-group procedure, preserving the particle-hole asymmetry of the two-impurity Kondo model, calculates the susceptibility, over 13 decades of temperature, and low-temperature specific heat. For large ferromagnetic RKKY couplings, a two-stage Kondo effect screens the triplet-correlated moments. For large antiferromagnetic couplings, the impurities develop singlet correlations and contribute Van Vleck terms to the low-temperature properties. For vanishing particle-hole asymmetry, previously found critical behavior emerges at low temperatures.

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