Superconducting and Magnetic Transitions in the Heavy-Fermion System URu2Si2

Abstract

The intermetallic compound U${\mathrm{Ru}}_2$ ${\mathrm{Si}}_2$ can be classified as a heavy-fermion system because of its large linear specific-heat coefficient $\gamma =180\mathrm{}$ mJ/mol·${\mathrm{K}}^2$. Susceptibility, magnetization, and specific-heat measurements on single-crystal samples indicate both a magnetic phase transition at 17.5 K and a superconducting transition at 0.8 K. The magnetic and superconducting properties are highly anisotropic.