Structural, Magnetic, Resistivity and Magnetoresistance Studies on Sr2-xBaxFeMoO6 (x = 0, 1 and 2) Double Perovskites

Double perovskite Sr2-xBaxFeMoO6 (x = 0, 1 and 2) (SBFMO) materials were synthesized by sol-gel technique in the presence of H2/Ar atmosphere at 1050 ºC. From X-ray analysis, it was observed that these double perovskite SBFMO materials crystallized in tetragonal structure for the composition x = 0 and, in cubic structure for composition x = 1 and 2. The coercivity (Hc), saturation magnetization (Ms) and remanent magnetization (Mr) of SBFMO samples were evaluated from magnetic measurements. The variation in electrical resistivity (ρ) within the temperature range of 5-300 K was done, by which semiconductor to metallic transformation has been detected in SBFMO sample. The Magnetoresistance (MR, %) was assessed with changes in temperature and magnetic field, revealing that the MR (%) values of SBFMO samples differ from the composition x = 1.