Abstract
A neutron-powder-diffraction study has been carried out on , which has the T’-type structure of the new high- electron superconductors. The compound orders antiferromagnetically at about 270 K. The magnetic intensities at 15 K can be equally well accounted for by a collinear magnetic structure with orthorhombic symmetry or a noncollinear structure with tetragonal symmetry. In both cases, Cu moments are coupled antiferromagnetically within the layers, the ordered moment being 0.48 at 15 K. Rietveld refinement at 298 and 15 K shows the crystal structure is essentially unchanged; in particular, there is no detectable distortion at low temperature.
- Received 14 April 1989
DOI:https://doi.org/10.1103/PhysRevB.40.6998
©1989 American Physical Society