Abstract
is a collinear antiferromagnet between =378 K and =93 K as shown by previous neutron diffraction and Mössbauer studies. Below , two different noncollinear antiferromagnetic structures are consistent with neutron diffraction results, one, called structure I, being canted along with c axis and the other, denoted structure II, being canted in the basal plane (001) along the [110] direction of the chemical cell of . On the other hand, two magnetic structures canted in the basal plane, and , which differ only in the propagation vector agree with Mössbauer spectra. The simultaneous use of the two techniques has allowed an unambiguous choice of structure which is simply characterized by a combination of the magnetic couplings observed in the high-temperature magnetic structures of and .
- Received 25 September 1986
DOI:https://doi.org/10.1103/PhysRevB.35.7038
©1987 American Physical Society