Abstract
Neutron diffraction has been used to study antiferromagnetic ordering in as a function of . Evidence for such ordering has been observed only in the tetragonal, nonsuperconducting phase (). The magnetic origin of the superlattice reflections has been confirmed with polarized beam measurements. A single antiferromagnetic structure was observed throughout the ordered phase, with a maximum Néel temperature of ∼500 K and average ordered moment of per magnetic Cu atom at . Magnetic susceptibility measurements suggest that two-dimensional correlations are strong, as in , and may survive into the orthorhombic phase.
- Received 7 March 1988
DOI:https://doi.org/10.1103/PhysRevB.38.2477
©1988 American Physical Society