Intergrain magnetoresistance in electron-doped Sr<inf>2</inf>FeMoO<inf>6</inf>

Electron-doped double perovskite compounds (Sr2-xLax)FeMoO6 (x = 0.0, 0.5, 0.7) were synthesized by combustion synthesis using Oxalic acid dihydrazide as fuel. There is an increase in Curie temperature (TC) with La substitution up to a value of 172 °C for (Sr1.3La0.7)FeMoO6. The compound (Sr1.5La0.5)FeMoO6 with increased TC compared to the undoped sample, exhibits a intergrain magnetoresistance of about 3% in a field of 0.1 T. The presence of magnetoresistance in La-doped samples prepared by combustion synthesis is due to the increased number of intergrain tunnel barriers.