Abstract
A three-dimensional antiferromagnetic ordering 3D-AF atT N ≈12K has been observed in these nonsuperconducting phases. In the compounds where a partial trivalent-divalent cationic substitution (Y by Ca or La by Sr) has been performed, this antiferromagnetic ordering is not observed above 4 K. Mossbauer spectroscopy studies indicate a unique iron environment and magnetic ordering; the spectra are consistent with the classic high spin Fe3+ although in an unusual fivefold coordination. Both the herein described transition and the formerly reported one at ∼460 K are affected upon doping.
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