Abstract
The magnetic ordering and ordered magnetic moments in uranium monochalcogenides (US, USE and UTE) was investigated by neutron diffraction. These measurements were undertaken to clarify the conflicting evidence from magnetization measurements. Measurements on powdered samples of USe and UTe show that these compounds are simple ferromagnets with the moments probably directed along the rhombohedral axis as found in a single crystal of US. Compared with an ordered magnetic moment (at 4.2 K) of 1.70+0.03 mu B in US, the values 2.0+or-0.1 mu B and 2.2+or-0.1 mu B were found in USe and UTe, respectively. These values are significantly higher than the values measured by magnetization due to the large magnetic anisotropy associated with the rhombohedral distortion and also due to conduction electron polarization effects.
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