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Publication TypeJournal Article
Year of Publication2019
AuthorsPathak, AK, Bonilla, CM, Paudyal, D, Mudryk, Y, Pecharsky, VK
JournalJournal of Alloys and Compounds
Volume774
Pagination321-330
Date Published02
Type of ArticleArticle
ISBN Number0925-8388
Accession NumberWOS:000449743600036
Keywordschemistry, dyal2, eral2, fields, First-order-phase-transition, Lanthanoids, Materials Science, Metallurgical Engineering, Rare earth, Specific heat, temperature, tmal2
Abstract

ompounds exhibit discontinuous, first-order anomalies in the magnetically ordered states. These sharp transitions correlate with a substantial energy difference between the room temperature cubic and ground state rhombohedral structures of TmAl2. A clear anomaly in the lattice parameter is observed at similar to 30 K for x = 0.5, which nearly coincides with T-C = 31.2 K. The effective quadrupolar moment of the lanthanides changes sign around x = 0.5, which leads to a nearly zero anisotropy constant and approximately spherical effective 4f charge densities, providing an explanation for the lack of structural distortions below T-C for x = 0.5. The calculations confirm [001] as the easy magnetization axis in the ground state tetragonal structure of DyAl2, and reveal collapse of the orbital magnetic moment when the easy magnetization direction changes to [111]. Within the rhombohedral ground state of TmAl2 [111] is the easy magnetization direction. (C) 2018 Elsevier B.V. All rights reserved.

DOI10.1016/j.jallcom.2018.09.365
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Alternate JournalJ. Alloy. Compd.