Abstract
The specific heat of erbium dihydride, ErH 1.99, was measured in the temperature range from 1.8–230 K. A λ-type specific heat anomaly, most probably due to an antiferrómagnetic transition has been found at T N = 2.13 ± 0.03 K. The influence of the crystal field of cubic symmetry on the splitting of the ground state 4 I 15 2 of the Er 3+ ion was analysed and the conclusion was drawn, that the doublet Γ 7 is the lowest lying crystal-field level.
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