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Magnetic field induced ab -plane rotation of the Eu magnetic moments in trigonal EuMg2 Bi2 and EuMg2 Sb2 single crystals below their Néel temperatures

Journal Article · · Physical Review. B
 [1];  [1];  [1];  [1]
  1. Ames Lab., and Iowa State Univ., Ames, IA (United States)
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The thermodynamic and electronic-transport properties of trigonal EuMg2Bi2 in ab-plane magnetic fields Hx 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 $$H^{c}_{x}$$ = 27.5 kOe at which the Eu moments become parallel to Hx. Here additional measurements at low fields are reported that reveal a new spin-reorientation transition at a field Hc1 ≈ 465 Oe where the Eu moments remain in the ab plane but become perpendicular to Hx. At higher fields, the moments cant toward the field resulting in M ∝ Hx up to $$H^{c}_{x}$$. Similar results are reported from measurements of the magnetic properties of EuMg2Sb2 single crystals, where Hc1 ≈ 220 Oe is found. Theory is formulated that models the low-field magnetic behavior of both materials, and the associated anisotropies are calculated. Further, the ab-plane trigonal anisotropy in EuMg2Sb2 is found to be significantly smaller than in EuMg2Bi2.
Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1905241
Alternate ID(s):
OSTI ID: 1900309
Report Number(s):
IS-J-10,957
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 18 Vol. 106; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
antiferromagnets
crystal growth
density functional theory
magnetic anisotropy
magnetic interactions
magnetic order
magnetism
magnetization measurements