Crystal and magnetic structure of CaCoAs studied by x-ray and neutron diffraction
Physical Review B—Condensed Matter and Materials Physics, 2013•APS
Neutron and x-ray diffraction measurements are presented for powders and single crystals
of CaCo 2 As 2. The crystal structure is a collapsed-tetragonal ThCr 2 Si 2-type structure as
previously reported, but with 7 (1)% vacancies on the Co sites corresponding to the
composition CaCo 1.86 (2) As 2. 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 …
of CaCo 2 As 2. The crystal structure is a collapsed-tetragonal ThCr 2 Si 2-type structure as
previously reported, but with 7 (1)% vacancies on the Co sites corresponding to the
composition CaCo 1.86 (2) As 2. 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 …
Neutron and x-ray diffraction measurements are presented for powders and single crystals of . The crystal structure is a collapsed-tetragonal -type structure as previously reported, but with 7(1)% vacancies on the Co sites corresponding to the composition . The thermal expansion coefficients for both the and 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 (1) K with the ordered moments directed along the tetragonal axis, aligned ferromagnetically in the ab plane and antiferromagnetically stacked along the c axis.
American Physical Society