Magnetic ordering in uranium monophosphide |
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Authors: | P. Burlet S. Quezel J. Rossat-Mignod R. Horyn |
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Affiliation: | Centre d''Etudes Nucléaires, DRF/SPh - MDN, 85 X, 38041 Grenoble Cedex, France;Institute for Low Temperature and Structure Research, Polish Academy of Sciences, 59-950 Wroc?aw, Poland |
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Abstract: | The magnetic ordering in uranium monophosphide (UP) has been studied by neutron diffraction from a single crystal in a magnetic field. UP orders at TN ? 122 ± 0.1 K with the type-I antiferromagnetic structure (+-+-), the ordering taking place in a first-order transition. At T0 = 22.5 K the ordered magnetic moment jumps from 1.7 μB to 1.9 μB. With a magnetic field H = 25 kOe applied along the [11̄10] direction, it is found that UP has the collinear single- type-I structure above T0 and undergoes a first-order transition to the planar double- type-I structure, accompanied by a “moment jump” due to the change in the moment direction from <001> to <110>. |
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