Abstract
AbstractIron‐57 Mössbauer spectroscopy confirms a high sensitivity of the three‐dimensional magnetic ordering temperature (TNéel) for a series of new intergrowth phases to both oxygen stoichiometry and the partial substitution of iron by copper and aluminium in the Ruddlesden‐Popper phase LaSr3Fe3010−δ. The chemical isomer shifts suggest that significant covalent electron delocalization exists in these phases. Spectra for the paramagnetic phases indicate two distinct iron coordination environments consistent with x‐ray and neutron diffraction structure determinations. The Mössbauer spectra at 4.8 K exhibit the overlap of two magnetic hyperfine patterns corresponding to cooperative magnetic order at the iron sites with internal fields of 45 and 27 Tesla for nominal Fe3+ and Fe4+ sites respectively.
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