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

Journal Article · Mon Nov 25 00:00:00 EST 2013 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.88.174420· OSTI ID:1133351

Quirinale, D. G. ^[1]; Anand, V. K. ^[1]; Kim, M. G. ^[1]; Pandey, Abhishek ^[1]; Huq, A. ^[2]; Stephens, P. W. ^[3]; Heitmann, T. W. ^[4]; Kreyssig, A. ^[1]; McQueeney, Robert J. ^[1]; Johnston, D. C. ^[1]; Goldman, Alan I. ^[1]

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1. Ames Laboratory
2. Oak Ridge National Laboratory
3. SUNY at Stony Brook
4. University of Missouri

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.

• Research Organization: Ames Lab., Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-07CH11358
• OSTI ID: 1133351
• Report Number(s): IS-J 8206
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 88; ISSN 1098-0121
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE