Hyperfine Structure of 57Fe in RbFeF3
- 1 February 1968
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 39 (2) , 1253
- https://doi.org/10.1063/1.1656252
Abstract
In magnetization and Mössbauer effect (ME) studies the cubic perovskite RbFeF3 exhibits magnetic phase changes at 39°, 87°, and 102°K. Above 102°K the material is paramagnetic. From 87° to 102°K the ME yields well‐resolved hfs showing the combined effects of magnetic‐dipole and electric‐quadrupole interactions. Both are consistent with an exchange splitting of the low‐lying, spin‐orbit triplet of Fe2+. However, the sublattice magnetization if proportional to (TN−T)1/3, indicating that a molecular‐field treatment is not applicable. Absence of remanence indicates that the crystal is antiferromagnetic in this region. Below 87°K remanence is observed and the ME spectra exhibit two magnetically inequivalent iron sites. The details of the transition to this state show that it is not obtained by a canting of the antiferromagnetic spin system. Below 39°K all iron atoms are again equivalent in the ME spectra. These yield Heff=252 kOe and quadrupole splitting of 0.27 cm/sec with the axis of the EFG tensor at 40° to the direction of the magnetization.This publication has 0 references indexed in Scilit: