Extraordinary colossal magnetoresistance in La0.67Ca0.33Mn1−xCrxO3 (x⩽0.3)

Abstract The magnetic and magnetotransport properties of La 0.67 Ca 0.33 Mn 1− x Cr x O 3 ( x ⩽0.3) perovskites have been studied. It was found that Cr doping is impotent in driving Curie temperature T c but brings about cluster glass behaviors. Moreover, the substitution with Cr on Mn sites introduces extraordinary electrical transport and colossal magnetoresistance (CMR) behavior, characterized by double peaks. As a result, the temperature range of CMR response is greatly broadened. These results suggest that Cr doping could be a potent way in tuning CMR.