Magnetic and magnetotransport properties in Cu and Fe co-doped bulk In₂O₃and ITO

Abstract

A systematic study of structural, magnetic, and transport properties was performed on (In0.85-xFe0.15Cux) 2O3 (IFCO) and (In0.80-xSn 0.05Fe0.15Cux)2O3 (ISFCO) compounds with x = 0, 0.02, and 0.05. All the studied samples show clear room temperature ferromagnetism and the saturated magnetic moment decreases monotonically with increasing Cu-doping content. Detailed analysis based on the magnetic measurement rules out the ferromagnetism due to Fe3O 4 and CuFe2O4 impurities. A crossover from semiconducting to metallic transport behavior is observed in IFCO samples, whereas only semiconducting behavior is detected in ISFCO. Low temperature resistivity decreases monotonically with increasing Cu-doping level due to the increasing electron concentration. Positive magnetoresistance is observed in IFCO, which also shows an anomalous Hall effect at 5 and 300 K. No magnetoresistance or AHE is found in ISFCO compounds. All the electric transport measurement results can be clarified by a two-channel transport model