Magnetic and magnetoresistive properties of La0.65−xEuxSr0.35MnO3

Abstract Eu-doped perovskites La 0.65− x Eu x Sr 0.35 MnO 3 (0.05 ≤ x ≤ 0.30) were synthesized by sol–gel method using citric acid and characterized by X-ray diffraction, magnetization, resistivity and magnetoresistance (MR) experiments. All samples had a single hexagonal perovskite structure. As x increased from 0.05 to 0.30, the Curie temperature T C for the samples decreased from 352 to 242 K. It was found that two transition points appeared when the resistivity changed with increasing temperature, and upon an application of a magnetic field of 20 kOe the maximum magnetoresistivity of 18% for the La 0.65− x Eu x Sr 0.35 MnO 3 with x = 0.20 was obtained at room temperature 300 K. The mechanism of the transitions for the samples was explored.