Room temperature magnetoresistance in La 0.67Sr 0.33Mn 1− xCr xO 3

Abstract

An enhancement of the room temperature magnetoresistance Δ R/ R 0 is induced by the substitution of Cr for Mn with appropriate content x in manganites La 0.67Sr 0.33Mn 1− x Cr x O 3. A peak of the room temperature magnetoresistance Δ R/ R 0 occurs at x≈0.15. Such enhancement may be correlated with shifts of Curie temperature and metal–insulator transition temperature to near room temperature through the Cr substitution. The decreasing of Δ R/ R 0 for larger x may be correlated with the corresponding lower metal–insulator transition temperature far from room temperature.