Mass renormalizations and superconductivity in heavy-fermionUPt3

The Eliashberg equations for magnetic fluctuations are solved for the case of ${\mathrm{UPt}}_3$. As input, the neutron data of Aeppli et al. are used for the spectral function, and the results of band-structure calculations are used to model the Fermi surface. The results indicate a mass renormalization factor of about 16, a value confirmed by comparisons of band calculations to de Haas–van Alphen data. Moreover, a superconducting transition temperature of the order of 0.1–0.2 K is calculated (due to the momentum dependence of the susceptibility) with polar gaps in parts of the zone.