Structure and magnetic properties of R-P phase Sr3Mn2? xFexO7?δ (0.10 ≤x≤ 0.5)

Double layer R-P (Ruddlesden-Popper) manganate phases were stabilized in an air atmosphere by partial substitution of Mn by Fe. The crystal structures and magnetic structures of the R-P phase Sr₃Mn_2−x Fe_xO_7−δ (x = 0.1, 0.2, and 0.5) have been refined from the room temperature and low temperature neutron diffraction data. All of these samples adopt space group I4/mmm at room temperature. 10 K diffraction patterns showed antiferromagnetic ordering and magnetic superlattice reflection pattern that can be indexed on a 2a ₀ × 2a ₀ × c ₀ supercell for x = 0.1 and x = 0.2 samples. The temperature dependence of the ZFC (zero field cooled) and FC (field cooled) molar magnetic susceptibility curve showed divergence for x = 0.5 samples which implies that this double R-P phase shows spin-glass transition.