Abstract
The two-dimensional two-magnon peak in ( decreases rapidly from x=0 to x=0.01. For x>0.03 scattering is observed over a very wide energy region from low energy to over 4000 . This indicates that the correlation length of the two-dimensional spin order decreases rapidly from x=0 to x=0.01. This decrease can be related to the rapid decrease of the three-dimensional antiferromagnetic transition temperature (), while at x>0.03 the correlation still retains a short length and a short time. At x<0.01 the scattering is in a resonant state with narrow electronic levels of which transition energy is about 18 000 . The narrowness of these energy levels, and the simultaneous extinction of resonance and the two-magnon scattering, suggest that these are localized levels relating to the Cu spins.
- Received 31 May 1988
DOI:https://doi.org/10.1103/PhysRevB.38.6436
©1988 American Physical Society