Abstract
The spin-disorder resistivity ρ m (T) of PrH2+x shows for the pure dihydride (x=0) a minimum in its temperature dependence above the magnetic ordering temperatureT N . This minimum can be explained qualitatively and quantitatively by a crystal-field effect if the ground state is e1 =Γ5 (a magnetic state) while the first excited state is e2 =Γ1 (a non-magnetic state). Forx=0.08, the magnetic ordering and the resistivity minimum tend to disappear which can be explained by the change of the crystalfield symmetry induced by the supplementary H-ions, leading to a splitting of the ground state.
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