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Title: Crystal and magnetic structure of CaCo1.86As2 studied by x-ray and neutron diffraction

Neutron and x-ray diffraction measurements are presented for powders and single crystals of CaCo2As2. The crystal structure is a collapsed-tetragonal ThCr2Si2-type structure as previously reported, but with 7(1)% vacancies on the Co sites corresponding to the composition CaCo1.86(2)As2. The thermal expansion coefficients for both the a and c axes are positive from 10 to 300 K. Neutron diffraction measurements on single crystals demonstrate the onset of A-type collinear antiferromagnetic order below the Néel temperature TN=52(1) K with the ordered moments directed along the tetragonal c axis, aligned ferromagnetically in the ab plane and antiferromagnetically stacked along the c axis.
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  1. Ames Laboratory
  2. Oak Ridge National Laboratory
  3. SUNY at Stony Brook
  4. University of Missouri
Publication Date:
OSTI Identifier:
Report Number(s):
IS-J 8206
Journal ID: ISSN 1098-0121
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 88
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States