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Hunds Rule Theory for Heavy Fermion Superconductors

M. R. Norman
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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 $UPt_3$ find a resultant pair state with $Γ_6^-$ symmetry, consistent with current experimental constraints.

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M. R. Norman. 1993-11-19. Hunds Rule Theory for Heavy Fermion Superconductors. https://doi.org/10.1103/physrevlett.72.2077

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