Integrain magnetoresistance in electron-doped Sr2FeMoO6

Abstract

Electron-doped double perovskite compounds (Sr2 La )FeMoO6 ( = 0 0 0 5 0 7) were synthesized by combustion synthesis using Oxalic acid dihydrazide as fuel. There is an increase in Curie temperature ( ) with La substitution up to a value of 172 C for (Sr1 3La0 7)FeMoO6. The compound (Sr1 5La0 5)FeMoO6 with increased 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.