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The magnetic structure of EuCu2Sb2

TitleThe magnetic structure of EuCu2Sb2
Publication TypeJournal Article
Year of Publication2015
AuthorsRyan, DH, Cadogan, JM, Anand, VK, Johnston, DC, Flacau, R
JournalJournal of Physics-Condensed Matter
Date Published05
Type of ArticleArticle
ISBN Number0953-8984
Accession NumberWOS:000354070400013
Keywordsearth intermetallics, magnetic structure, Mossbauer spectroscopy, neutron diffraction, neutron powder diffraction, pnictides, rare

Antiferromagnetic ordering of EuCu2Sb2 which forms in the tetragonal CaBe2Ge2-type structure (space group P4/nmm #129) has been studied using neutron powder diffraction and Eu-151 Mossbauer spectroscopy. The room temperature Eu-151 isomer shift of - 12.8(1) mms(-1) shows the Eu to be divalent, while the Eu-151 hyperfine magnetic field (B-hf) reaches 28.7(2) T at 2.1 K, indicating a full Eu2+ magnetic moment. B-hf (T) follows a smooth S = 7/2 Brillouin function and yields an ordering temperature of 5.1(1) K. Refinement of the neutron diffraction data reveals a collinear A-type antiferromagnetic arrangement with the Eu moments perpendicular to the tetragonal c-axis. The refined Eu magnetic moment at 0.4K is 7.08(15) mu(B) which is the full free-ion moment expected for the Eu2+ ion with S = 7/2 and a spectroscopic splitting factor of g = 2.

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Complex States