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Abstract
Electron irradiation of the divalent b.c.c. rare earth metal Eu has permitted determination of its displacement threshold energy, T d1 (Eu) = 7.5±0.5 eV, after fitting with a three-step displacement probability function. The Frenkel pair resistivity is composed of a phononic and of a spin-disorder term; a tentative value of ρf ≳ 100 × 10−4 Ohm cm/F.P. is proposed. The low-temperature recovery spectrum after irradiation at 10 K contains stages between 12 and 22 K, a main annealing region with two peaks at 67 and 77 K, and a small stage at 110 K; more than 90% of the damage has recovered at 160 K.