Abstract
170Yb- and 57Fe-Mössbauer spectra are reported for orthorhombic phase manganites YbMnO3 and Yb(57Fe0.005Mn0.995)O3, respectively. Point charge model estimates of the electric field gradient agree well with experimental 57Fe-Mössbauer results in terms of both sign and magnitude of the electric quadrupole interaction strength, and the orientation of the magnetic hyperfine field is consistent with an E-type antiferromagnetic order where Mn moments are aligned along the a-axis (Pnma notation). The 170Yb-Mössbauer spectra exhibit pure quadrupole splitting down to 1.8 K, contradicting an earlier report that the Yb sub-lattice orders in it own right at TYb ≈ 4 K. Nevertheless, there is a slight increase in line broadening with decreasing temperature, probably due to the weak magnetic exchange field arising out of the ordered Mn sub-lattice. The small variation with temperature of the quadrupole interaction strength suggests that the Yb3+ electronic ground state is a well-isolated Kramers doublet.
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Proceedings of the 5th Joint International Conference on Hyperfine Interactions and International Symposium on Nuclear Quadrupole Interactions (HFI/NQI 2014) Canberra, Australia, 21–26 September 2014
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Stewart, G.A., Salama, H.A., Voyer, C.J. et al. A Mössbauer investigation of orthorhombic phase YbMnO3. Hyperfine Interact 230, 195–203 (2015). https://doi.org/10.1007/s10751-014-1092-x
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DOI: https://doi.org/10.1007/s10751-014-1092-x