Crystal structural, magnetic, and electrical transport properties of Sr_(1.1)K_(0.9)FeMoO_6 double perovskite

摘要

The crystal structure and physical properties of the double perovskite Sr_(1.1)K_(0.9)FeMoO_6 have been investigated. The structure of this double-perovskite compound is assigned to a tetragonal system with space group I4/mmm and X-ray diffraction data suggest that the Fe and Mo ions are partially ordered on B-sites. Thermal magnetization demonstrates that the metamagnetic transition temperature is about 275 K. At room temperature the isothermal magnetization, M–H, shows that the saturation magnetic moment per formula unit in the direction of the magnetization is 3.22u_B (300 K). The electrical resistivity is mainly governed by the Stoner spin fluctuation scattering below the metamagnetic transition and by spin waves and phonon scattering above 275 K. Evident magnetoresistance can be observed under 0.5 and 1.0 T magnetic fields in the studied temperature range.