Bulk superconductivity in the heavy-fermion superconductorUPt3

Abstract

We have investigated the superconducting properties of ${\mathrm{UPt}}_3$ by determining the Meissner effect via ac and dc susceptibility and magnetization measurements. We found an upper and lower limit of the superconducting volume fraction of 80% and 30% with magnetization and flux expulsion experiments, respectively. Thus, the superconductivity of ${\mathrm{UPt}}_3$ is a bulk property.