The disorder is induced by S doping at O-sites in double perovskite Sr2FeMoO6 compound

Abstract We have investigated the crystal, structural and physical properties of polycrystalline Sr 2 FeMoO 5.5 S 0.5 . The structure of this compound is assigned to the tetragonal system with space group I 4/mmm and the Rietveld refinement results show that there exist about 23% of anti-sites. Thermal magnetization demonstrates the Curie temperature to be higher than 300 K. Thermal magnetization and isothermal magnetic measurements show a magnetic or structural phase transition at around 190 K. The saturation moment obtained from Rietveld refinement results and isothermal magnetic curve are 2.21 and 2.04 μ B (78 K), respectively. The evident magnetoresistance is observed under 0.5 and 1.0 T magnetic fields in cooling and warming modes, respectively. Variation of the coefficients in T 1/2 , T 2 and T 3/2 terms follows the residual resistivity in both modes. The residual resistivity decreases with magnetic field. Under 0 T magnetic fields the coefficient in T 2 term is inversely proportional to spin-wave stiffness constant, D , in both modes.