Pressure dependence of spin-fluctuation effects in the specific heat of the heavy-fermion superconductor UPt3

UPt/sub 3/ is a heavy-fermion superconductor with indications of coexisting long-range ferromagnetic spin fluctuations. Measurements of its specific heat at pressures of 0, 3.8, and 8.9 kbar between 0.35 and 20 K show that the spin-fluctuation terms are extremely sensitive to pressure: the linear term decreases by --25% at 8.9 kbar; the T-italic/sup 3/ and T-italic/sup 3/ lnT-italic terms decrease by factors of the order of 4. Comparison with the pressure dependence of the critical temperature suggests that the superconductivity is of a form that is e-italicn-italich-italica-italicn-italicc-italice-italicd-italic by spin fluctuations.