Abstract
Results for the temperature dependence of the magnetic susceptibility for , (, and ( with various Y concentrations are reported. The magnetic anomalies that occurred at (Cu)∼285 K and ∼20 K in , are not observed in or , and are seen in ( and ( with x≥0.3 and x≥0.05, respectively. It is found that the transition temperatures (Cu) and and the magnitudes of anomalies are very sensitive to Y substitution. Thus, the effect of small ionic radius for Gd plays a much more important role than its large moment on the anomalous magnetic properties of . This also provides clear evidence that the magnetic anomalies in are due to weak ferromagnetism in the Cu-O plane resulting from the too small ionic radius of Gd, which induces a lattice distortion in the T’ structure.
- Received 11 March 1993
DOI:https://doi.org/10.1103/PhysRevB.48.7720
©1993 American Physical Society