Abstract
We attempt to assess the importance of spin fluctuations in the heavy-fermion system UPt/sub 3/, the most unambiguous evidence for which is the T/sup 3/ lnT term in the specific heat. We investigate whether other contributions, such as that from a peak in the electronic density of states or from the electron-phonon interaction, could account for the experimental data. We conclude that they cannot although the data are consistent with the presence of both a T/sup 3/ lnT term and a density-of-states peak of width greater than about 60 K. We determine the input parameters for the paramagnon theory with a self-consistent method developed by Boring, Albers, Stewart, and Koelling for UAl/sub 2/ and we calculate the s- and p-wave pairing interactions. A one-band model favors p-wave pairing, while a two-band model leads to conventional s-wave superconductivity.
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