SPIN-GLASS BEHAVIOR IN URH2GE2

URh2Ge2 occupies an extraordinary position among the heavy-electron 12 2 compounds, by exhibiting a previously unidentified form of magnetic correlations at low temperatures instead of the usual antiferromagneti sm. Here we present new results of ac and de susceptibilities, specifi c heat, and neutron diffraction on single-crystalline as-grown URh2Ge2 . These data clearly indicate that crystallographic disorder on a loca l scale produces spin glass behavior in the sample. We therefore concl ude that URh2Ge2 is a 3D Ising-like, random-bond, heavy-fermion spin g lass.