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

TitleCrystal and magnetic structure of CaCo1.86As2 studied by x-ray and neutron diffraction
Publication TypeJournal Article
Year of Publication2013
AuthorsQuirinale DG, Anand VK, Kim MG, Pandey A, Huq A, Stephens PW, Heitmann TW, Kreyssig A, McQueeney RJ, Johnston DC, Goldman AI
Journal TitlePhysical Review B
Volume88
Pages174420
Date Published11
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000327314700005
Keywordshigh-temperature superconductivity, laco2p2, order, phase-transitions, phosphides caco2p2, pressure, structure, ternary arsenides, thcr2si2
Abstract

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 Neel temperature T-N = 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.

URL<Go to ISI>://WOS:000327314700005
DOI10.1103/PhysRevB.88.174420