Weak Ferromagnetism and Magnetoresistance in Sm1/3 Sr2/3 FeO2.95
The temperature dependence of the magnetization (ac and dc) indicate that Sm1/3Sr2/3FeO3-d undergoes an antiferromagnetic transition at TN = 150 K. In low applied fields, the zero field cooled (ZFC) and field cooled (FC) magnetization below TN exhibit a hysteretic behavior. This behavior is suppressed by high applied field. The ac susceptibility for Sm1/3Sr2/3FeO2.95 shows that there is a clear frequency dependence developing below TN. The relusts of both ac and dc measurements suggest that the antiferromagnetic long-range order coexist with ferromagnetic correlations. Field-dependent resistivity versus temperature measurements reveal the existence of a magnetoresistance (MR) in the temperature below TN. The appearance of some ferromagnetic component within an antiferromagnetically ordered state may be responsible for the MR at low temperature.
Wei Pan, Jianghong Gong, Chang-Chun Ge and Jing-Feng Li
Y.M. Zhao and H.J. Quan, "Weak Ferromagnetism and Magnetoresistance in Sm1/3 Sr2/3 FeO2.95", Key Engineering Materials, Vols. 280-283, pp. 461-464, 2005