Abstract
Neutron diffraction experiments were performed on polycrystalline UI3 in the temperature range from 1.3 to 293K in order to clarify anomalies which were observed in previous measurements. The present neutron results prove the existence of three-dimensional long-range antiferromagnetic order in UI3 below TN=(2.8+or-0.1)K. The magnetic structure corresponds to k vector (1/2,1/2,1/2), and the magnetic moments of U3+ are oriented parallel to a. Similarly to MnO the U moments of adjacent ferromagnetic (111) layers are aligned in opposite directions. The ordered saturation moment mu U=(1.98+or-0.05) mu B of U3+ (5f3, 4I9.2) at 1.3K indicates a substantial crystal-field reduction. Considerable antiferromagnetic short-range order is observed at temperatures above TN. The parameters of the PuBr3 structure of UI3 were refined by means of the profile method both at 293 and 4.2K.
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