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Title: The magnetic structure of EuCu 2Sb 2

Antiferromagnetic ordering of EuCu 2Sb 2 which forms in the tetragonal CaBe 2Ge 2-type structure (space group P4/nmm #129) has been studied using neutron powder diffraction and 151Eu Mössbauer spectroscopy. The room temperature 151Eu isomer shift of –12.8(1) mm/s shows the Eu to be divalent, while the 151Eu hyperfine magnetic field (B hf) reaches 28.7(2) T at 2.1 K, indicating a full Eu 2+ magnetic moment. B hf(T) follows a smooth $$S=\frac{7}{2}$$ 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. As a result, the refined Eu magnetic moment at 0.4 K is 7.08(15) μ B which is the full free-ion moment expected for the Eu 2+ ion with $$S=\frac{7}{2}$$ and a spectroscopic splitting factor of g = 2.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [4]
  1. McGill Univ., Montreal, QC (Canada)
  2. UNSW Canberra at the Australian Defense Force Academy, Canberra (Australia)
  3. Iowa State Univ., Ames, IA (United States)
  4. Chalk River Lab., Chalk River, ON (Canada)
Publication Date:
Report Number(s):
IS-J-8667
Journal ID: ISSN 0953-8984
Grant/Contract Number:
AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 27; Journal Issue: 20; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Mossbauer spectroscopy; neutron diffraction; magnetic structure; rare earth pnictide compounds
OSTI Identifier:
1227300