Disorder enhanced intrinsic electroresistance in Sm 0.60Sr 0.40Mn 1-xFe xO 3

Abstract

The intrinsic electroresistance (ER) of polycrystalline Sm 0.60Sr 0.40Mn 1-xFe xO 3 (0 ≤ x ≤ 0.02) have been investigated by magnetotransport measurements. It is found that the ER increases with x while it is suppressed by a magnetic field. These observations imply that the ER increases dramatically with the inhomogeneity in the samples. The possible mechanisms responsible for the observed behavior are discussed. © 2012 American Institute of Physics.