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Title: The magnetic structure and magnetization distribution of the intermetallic compound U₁₄Au₅₁
Author: Smith, Jacqui G.
ISNI:       0000 0001 3441 6715
Awarding Body: Loughborough University
Current Institution: Loughborough University
Date of Award: 1997
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The antiferromagnetic structure of the intermetallic compound U₁₄Au₅₁ has been determined from neutron polarimetric measurements and refined by combining these data with integrated intensity measurements. The structure was found to be non-collinear with the U moments confined to the a- b plane. The moments of the U atoms in each of the two sets of sixfold sites are arranged hexagonally with rotations of 60° between them and the two sets are rotated with respect to each other by 50°. The third (twofold) set of U atoms has no ordered moment. These conclusions are in disagreement with a previous determination of the magnetic structure from powder data which gave a collinear structure with moments parallel to the c-axis. Magnetization measurements made on single crystals in the temperature range 300-2K can be understood in terms of a transition to a non-collinear easy plane antiferromagnetic structure stable below 22K. Polarized neutron measurements have been used to determine the contribution of each of the U sites to the susceptibility between 22 and 2K. These show that of the two sixfold U sites, that with the smaller ordered moment contributes more than half of the total susceptibility. The twofold site, which is characterized by a small U-U separation, makes the smallest contribution.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Metallurgy & metallography