RARE-EARTH-IRON EXCHANGE INTERACTION IN THE GARNETS. II-EXCHANGE POTENTIAL FOR YTTERBIUM.
Abstract
To determine the magnitude of the anisotropy of the ytterbium-iron (Yb-Fe) exchange interaction we have evaluated the exchange splittings of the lowest 2F(5/2) and 2F(7/2) doublets of ytterbium (Yb3+) in ytterbium iron garnet. By using the wave functions of Yb3+ in yttrium gallium garnet (those for YbIG are not known) these splittings are expressed in terms of ten parameters which characterize the anisotropy of the exchange interaction. As there are only six experimental splittings it is necessary to reduce the number of unknowns by assuming: (1) that the rare-earth-iron (RE-Fe) exchange interaction take place through the neighboring eight oxygen ions, and (2) (somewhat more uncertainly) that the rare-earth-oxygen (RE-O) exchange interaction si axial about the Re-O axis. This leads to expressing the exchange splittings in two sets of four exchange constants. A good four parameter fit of the experimental exchange splittings was found by adopting essentially zero values for the rare-earth-ferric ion exchange interactions that take place through the nearest neighbor oxygen ions (at 2.37A). (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1965
- Accession Number
- AD0624719
Entities
People
- Peter M. Levy
Organizations
- University of Pennsylvania