Probe Mössbauer Study of Magnetically Ordered Manganite \({\text{ScMn}}_{{{\text{0}}{\text{.996}}}}^{{{\text{57}}}}{\text{F}}{{{\text{e}}}_{{{\text{0}}{\text{.004}}}}}{{{\text{O}}}_{{\text{3}}}}\)

Abstract

Magnetic hyperfine interactions of ⁵⁷Fe probe Mössbauer nuclei introduced into the ScMnO₃ manganite lattice with a hexagonal crystal lattice have been studied for the first time. Based on the data obtained, the valence state of the probe iron atoms, their local crystal environment, and the orientation of magnetic Fe³⁺ cations in the \({\text{ScMn}}_{{{\text{0}}{\text{.996}}}}^{{{\text{57}}}}{\text{F}}{{{\text{e}}}_{{{\text{0}}{\text{.004}}}}}{{{\text{O}}}_{{\text{3}}}}\) structure in a magnetically ordered state at T < T_N have been determined. Within the framework of the stochastic relaxation model, the temperature dependence of the Zeeman structure of the ⁵⁷Fe spectra has been analyzed, which has yielded new data on the frustrated Fe−O−Mn exchange interactions. The critical indices of the power-law dependence of the hyperfine magnetic field H_hf(T) on ⁵⁷Fe nuclei have been determined, indicating a reduced dimensionality of the magnetic subsystem of the magnetically ordered manganite \({\text{ScMn}}_{{{\text{0}}{\text{.996}}}}^{{{\text{57}}}}{\text{F}}{{{\text{e}}}_{{{\text{0}}{\text{.004}}}}}{{{\text{O}}}_{{\text{3}}}}\).