Abstract
Infrared measurements and linear-spin-wave calculations for single-crystal (x=0.0, 0.4, 1.0) in magnetic fields up to 30 T show that absorption features which have been ascribed to magnon excitations are very insensitive to the applied field. The substitution of for leads to an additional absorption feature, which does have a strong field dependence. This excitation is assigned to an intermultiplet transition in the ion. The zero-field temperature dependence of this absorption shows clear evidence of an interaction between Cu and Pr spins.
- Received 22 November 1996
DOI:https://doi.org/10.1103/PhysRevB.55.11096
©1997 American Physical Society