Abstract
As-cast single crystals of URh 2Ge 2 are heavy fermions which also behave as random-bond spin glasses. This is unusual among compounds with a translationally invariant lattice of magnetic ions. We have carried out μ + SR experiments on a single crystal in both the as-grown and annealed states. Strong spin depolarization is observed when the temperature is lowered below 15 K, but no spontaneous precession has been found. Experiments in a longitudinal field showed this relaxation to be of a static origin. This indicates the presence of large and random dipolar fields at the muon site, thus of large and randomly ordered magnetic moments. The depolarization function can be described by a stretched exponential, characteristic for spin glasses. Experiments with different angles between the crystalline axes and the initial μ + spin failed to show any anisotropy of the depolarization rate. Also, the effect of annealing (one week at 900°C) is very small.
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