Abstract
Using high-pressure Raman scattering, we have directly measured the pressure dependence of the in-plane superexchange interaction J in antiferromagnetic between 1 bar and 100 kbar. We find that J has a substantially weaker pressure dependence than in conventional magnets. We also show that the Hubbard-model parameters describing the low-energy electronic structure are significantly influenced by out-of-plane compositional and structural variations. Finally, we show that the relationship between J and the Neél temperature is poorly described by current theory.
- Received 26 April 1991
DOI:https://doi.org/10.1103/PhysRevB.44.4657
©1991 American Physical Society