Hunds Rule Theory for Heavy Fermion Superconductors
Abstract
In this paper, a generalization of standard spin fluctuation theory is considered which takes into account orbital degeneracy effects which are critical for describing f electrons. This theory leads to an instability for a superconducting pair state which obeys Hunds rules. Such a state has L=5, S=1, and J=4. The degeneracy of this state is broken by crystalline effects, and realistic calculations for UPt3 find a resultant pair state with 6- symmetry, consistent with current experimental constraints.
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