High-pressure magnetism of the double perovskite Sr2FeOsO6 studied by synchrotron Fe57 Mössbauer spectroscopy

Effects of iron substitution and anti-site disorder on crystal structures, vibrational, optical and magnetic properties of double perovskites Sr2(Fe1−xNix)TeO6

“…Similar behavior has been reported for iron in other ferrate DP structures which also have the monoclinic structure with an anti-site effect of cations between B and B′ sites, such as ALaFeTiO 6 (A = Ca, Sr, Ba) double perovskite oxide. [53][54][55] Therefore, the obtained results from Mössbauer spectroscopy are consistent with the Rietveld refinement study.…”

“…According to the obtained values for the center shift (δ) and quadrupole splitting (QS) (see Table 7), it can be summarized that the iron in this structure is predominantly Fe 3+ in the high spin state 25,[52][53][54] and that those Fe ions reside at two different crystallographic sites, each distorted octahedral sites. The spectrum and fit to the data obtained for Sr 2 FeTeO 6 is consistent with that obtained for the same material by Ortega-San Martin et al 25 In addition to the two doublets fitted to their data, our spectra also clearly contain an additional component, which can be fitted by a doublet, with small shoulders at approximately +1.5 mm s −1 and −0.8 mm s −1 which were not fit in the previous study, although the presence of such a component can clearly be seen in the spectrum reproduced by Ortega-San Martin et al 25 Here, we obtained very similar shoulders in our data for the x = 0, 0.25 and 0.50 and 0.75 samples, which we could also fit satisfactorily.…”

Free-standing 2D non-van der Waals antiferromagnetic hexagonal FeSe semiconductor: halide-assisted chemical synthesis and Fe2+ related magnetic transitions

“…It is worth noting that the co-existence of paramagnetism and magnetic order has also been observed in other materials. 41 As the temperature decreased to 30 K, there were five different Fe sites, with Fe sites 1, 2, 3, and 4 of antiferromagnetism and Fe site 5 of paramagnetism ( Fig. 4h ).…”

Methods and Protocols: Practical Magnetic Measurement

“…Mossbauer spectroscopy answers some of these questions. 49 At high temperature, the Mossbauer spectrum exhibits one feature, which has shoulders on either side. The shoulders on the peak indicate that there are at least two iron sites in this material that each give rise to a different characteristic energy or velocity.…”

“…From magnetometry data, it remained unclear what spin textures these transitions involved, and why the higher-temperature feature was so broad. Mössbauer spectroscopy answers some of these questions …”