Volume changes at the magnetic transitions of UP
- 1 April 1979
- journal article
- Published by EDP Sciences in Le Journal de Physique Colloques
- Vol. 40 (C4) , C4-34
- https://doi.org/10.1051/jphyscol:1979412
Abstract
We measured the thermal expansion of a polycrystalline lump of uranium monophosphide, using a sensitive capacitance dilatometer. On heating, we observed at 22 K a first order phase change accompanied by a linear contraction of Ɗl/l = - 6.8 x 10-5. This phase transition is unusual as it is not accompanied by any obvious symmetry changes. At TN we observed a sudden expansion : Ɗl/l = + 1.2 x 10-5, indicating a first order phase change, contrary to previous assumptionsKeywords
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