Magnetic order changes in Al substituted Sr2FeMoO6 double perovskites

Abstract We have studied the effect of Al substituting for Fe in Sr 2 (Fe 1− x Al x )MoO 6 ( x ⩽0.3) double perovskites. X-ray diffraction, magnetic measurements at low and room temperature and Mossbauer spectroscopy have been used to determine the structural and magnetic properties of these compounds. The main observed effect is an increase with respect to the undoped composition, of the cationic order with Al doping levels up to 20%. This ordering effect is accompanied by an increase of the magnetic moment per Fe atom, but not by corresponding higher Curie temperatures.