Magnetoresistance Effect in (La 0.9 Nd 0.1 ) 2/3 Ca 1/3 Mn 1-x Fe x O 3 （x=0, 0.05）

Due to the remarkable magnetoresistance (MR) effect on perovskite-type manganite, magnetoelectronics and spintronics have become attractive subjects of experimental and theoretical investigations for the application purpose. (La0.9Nd0.1)2/3Ca1/3Mn1-xFexO3(x=0, x=0.05) were prepared successfully by sol-gel method. The structure, magnetic properties, and transport properties of the compounds were investigated. The magnetoresistance effect depends on the composition and the temperature. XRD patterns show that the compound is a single phase polycrystal with pseudocubic structure. A large negative isotropic magnetoresistance effect in the samples were observed at low temperature region. The maximum MR of the samples was 77% and 97%, respectively. It was most likely due to the scattering or the tunneling transport of spin-polarized carriers in lattice under strong magnetic field.