Abstract
AbstractUsing a pulse saturation method with optical detection of the recovery of fluorescent light, the temperature dependence and angular anisotropy of the spin‐lattice relaxation rate T of U3+ in anhydrous lanthanum trichloride has been measured. In the range 1.5 K ≦ T ≦ 4.2 K the direct relaxation process was found to be dominant, leading to a relaxation rate which can be fitted to the expression T = 4.16(5)T s−1 with the anisotropy coefficient of the direct process A (θ = 90°)/A (θ = 0°) ≈ 10. Both results are comparable with the data measured for the corresponding 4f3 ion, Nd3+ in LaCl3.
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