Magnetic field induced ab-plane rotation of the Eu magnetic moments in trigonal EuMg2Bi2 and EuMg2Sb2 single crystals below their Neel temperatures
Date
2022-11-28
Authors
Pakhira, Santanu
Lee, Yongbin
Ke, Liqin
Johnston, D. C.
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Iowa State University Digital Repository, Ames IA (United States)
Abstract
The thermodynamic and electronic-transport properties of trigonal EuMg2Bi2 in ab-plane magnetic fields Hz and the A-type antiferromagnetic structure have recently been reported. The Eu magnetic moments with spin S = 7/2 remain locked in the ab plane up to and above the ab-plane critical field Hcz = 27.5 kOe at which the Eu moments become parallel to Hz. Here additional measurements at low fields are reported that reveal a new spin-reorientation transition at a field Hc1 ti 465 Oe where the Eu moments remain in the ab plane but become perpendicular to Hz. At higher fields, the moments cant toward the field resulting in M oc Hz up to Hcz. Similar results are reported from measurements of the magnetic properties of EuMg2Sb2 single crystals, where Hc1 ti 220 Oe is found. Theory is formulated that models the low-field magnetic behavior of both materials, and the associated anisotropies are calculated. The ab-plane trigonal anisotropy in EuMg2Sb2 is found to be significantly smaller than in EuMg2Bi2.
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IS-J 10957
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This article is published as Pakhira, Santanu, Yongbin Lee, Liqin Ke, and David C. Johnston. "Magnetic field induced a b-plane rotation of the Eu magnetic moments in trigonal EuMg 2 Bi 2 and EuMg 2 Sb 2 single crystals below their Néel temperatures." Physical Review B 106, no. 18 (2022): 184423.
DOI: 10.1103/PhysRevB.106.184423.
Copyright 2022 American Physical Society.
Posted with permission.
DOE Contract Number(s): AC02-07CH11358