Large positive magnetoresistance effect below Curie temperature in In1.90-xMn0.1SnxO3
Journal
Journal of Applied Physics
Journal Volume
101
Journal Issue
9
Date Issued
2007
Author(s)
Abstract
We report on the magnetoresistance (MR) and magnetic properties of In1.90−xMn0.1SnxO3 (0⩽x⩽0.06) oxide. All samples were found to be ferromagnetic below TC=46K. Sn doping changed In1.90Mn0.1O3 from an insulator to a highly conducting phase at 300K. A positive MR effect was observed over a wide temperature range just below TC. Calculated MR values reached a maximum of 20% at 5K. A change in the MR effect, from positive to negative, occurred under magnetic field H>4T at 5K. The results of x-ray absorption near-edge spectroscopy indicated that Mn ions are present both as Mn2+ and Mn4+.
Type
journal article