Abstract
Structural and magnetic studies of the phases ( and ) have been made. The presence of iron in these fluorides showing columnar structures allowed a complete investigation using Mössbauer experiments without and with magnetic field. The values of hyperfine field at iron sites indicate an appreciable zero-point spin reduction. High-field Mössbauer spectrometry and neutron diffraction evidence, on the other hand, a non-collinear magnetic structure that can be attributed to the existence of magnetic topological frustration. This frustration is the consequence of antiferromagnetic interactions within the cationic triangular units of the crystal structure. Also, the lowering of hyperfine field at iron sites is consistent with the 1D magnetic character of the isolated triple chains of octahedra characteristic of these compounds in addition to the magnetic frustration implied by the cationic topology.
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