Electronic structure and mass enhancement of the heavy fermion superconductor UPt3

The self-consistent general potential linearized augmented plane wave method has been applied to study the energy bands of the heavy fermion superconductor UPt3 within the local density approximation. We found 2.5 f-electrons per U atom and a f-band width of approx.=1.9 eV pinned at the Fermi energy Esub(F). An enhancement factor of 17 is deduced from the density of states at Esub(F) and the experimental linear coefficient of the specific heat. Possible sources of the renormalization are discussed based on available experimental information. (orig.)