${\mathrm{URh}}_2{\mathrm{Ge}}_2$ occupies an extraordinary position among the heavy-electron 122 compounds, by exhibiting a previously unidentified form of magnetic correlations at low temperatures instead of the usual antiferromagnetism. Here we present new results of ac and dc susceptibilities, specific heat, and neutron diffraction on single-crystalline as-grown ${\mathrm{URh}}_2{\mathrm{Ge}}_2$. These data clearly indicate that crystallographic disorder on a local scale produces spin glass behavior in the sample. We therefore conclude that ${\mathrm{URh}}_2{\mathrm{Ge}}_2$ is a 3D Ising-like, random-bond, heavy-fermion spin glass.

• Received 18 September 1996

DOI:https://doi.org/10.1103/PhysRevLett.78.354