Abstract
A pair of magnetically coupled Anderson impurities is studied by a variational method which is an extension of that used for mixed-valence Tm ions. The staggered susceptibility is enhanced when the magnitude of the antiferromagnetic coupling J between two impurities competes with the Kondo energy scale of a single impurity, although it does not show divergence. is, however, enhanced further by introducing the orbital degeneracy, and finally diverges at a critical value of J in the Coqblin-Schrieffer limit.
- Received 29 January 1991
DOI:https://doi.org/10.1103/PhysRevB.44.450
©1991 American Physical Society