MuSR measurements in zero field were performed in ZrMn2 and ZrMn2H3.2.
The results confirm the existence in the hydride of a sluggish, spin-
glass type magnetic transition. The dependence on temperature of the a
symmetry of the muon disintegration shows that magnetic ordering begin
s to take place around 180 K, and suggests the existence of clusters o
f ordered Mn moments. Relaxation effects attributed to fluctuations of
clustered magnetic moments are observed in the range 100 K - 190 K.