Abstract
We have prepared Sr3FeMoO6.88(1), an oxygen-deficient two-dimensional analogue of the double perovskite Sr2FeMoO6, and have investigated its structure and physical properties. According to powder X-ray and neutron diffraction data, Sr3FeMoO6.88 adopts the tetragonal n = 2 Ruddlesden−Popper structure (space group I4/mmm) with a completely disordered B-cation distribution and oxygen vacancies occurring preferentially at the axial O1 sites between the perovskite layers. X-ray absorption near-edge spectroscopy and Mossbauer data are consistent with trivalent Fe and mixed (4+/5+) Mo oxidation state. The compound is semiconducting, showing an intrinsic magnetic transition at ∼85 K and an additional upturn in the magnetic susceptibility at ∼270 K, the latter is associated with intergrowth defects. An appreciable magnetoresistance, reaching the value of ∼−15% at 5 K and 5 T is also observed
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