Anomalous Hall Effect and Magnetoresistance of SrFe_1−xCo_xO_3−δ

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Transport and magnetic studies on polycrystalline samples of SrFe_1−xCo_xO_3−δ have been carried out to investigate the relationship between the magnetic structure and the anomalous Hall resistivity ρ_H. The hysteretic behavior of the magnetization observed in the measurements with varying temperature T up and then down after zero field cooling indicates that the system has the reentrant spin-glass phase, which is supported by the increasing width of the magnetic reflections observed by neutron diffraction with decreasing T below the Curie temperature T_C. Detailed analyses of the observed Hall resistivity ρ_H indicate that the anomalous Hall coefficient exhibits unusual behavior in the reentrant spin-glass phase. The magnetic field (H)- and T-dependence of the magnetoresistance of the present system can be understood by a spin dependent tunneling model.