The interactions in heavy-electron fluctuating-valence metals are discussed. The conclusion is that the state is closely analogous to "Brinkman-Rice" Fermi liquids like ³He in which parallel-spin effective interactions are attractive and antiparallel interactions strongly repulsive; hence, "triplet"---actually oddparity---superconductivity is the most likely possibility.
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P. W. Anderson (1984) studied this question.
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