Abstract
170Yb and57Fe Mössbauer spectra are reported for hexagonal phaseYbMnO3 and Yb(57FexMn1−x)O3 (x = 0.005, 0.01), respectively. The dilute concentrations of57Fe are demonstrated to provide a reliable, non-perturbing Mössbauer spectroscopyprobe of the Mn sub-lattice magnetization. Substitution of up to 1 at.%57Fe exerts negligible influence on the Néel temperature(TN1≈88–89 K) and point charge model estimates of the electric field gradient agree well with experimental57Fe Mössbauer results in terms of both sign and magnitude. The170Yb Mössbauer spectrum recorded at 4.5 K provides support for strong crystal fieldquenching with isolated Kramers doublet ground states at both Yb sites.A ‘static’, five-line sub-spectrum is tentatively assigned to the 4b site, forwhich the slowed fluctuation of the Kramers doublet is attributed to non-zeromagnetic exchange with the antiferromagnetic Mn sub-lattice. This is not the casefor the 2a site whose sub-spectrum is a motionally narrowed single line. On thebasis of this work, the saturation magnetization for the ordered Yb sub-lattice(TN2≤3 K) isestimated at ≈1.8 µB per formula unit, in close agreement with single-crystal magnetization data reportedelsewhere.
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