Effect of Ce doping on structural, magnetic, and transport properties of SrMnO3 perovskite -: art. no. 224418

We have systematically investigated the structural, magnetic, and transport properties of the Sr1-xCexMnO3 (0less than or equal toxless than or equal to0.35) system as a function of temperature and magnetic field. For xgreater than or equal to0.10, the system does not show any long-range magnetic ordering but spin-glass-like behavior at low temperatures below T-SG. The in-phase susceptibility chi below T-SG decreases and T-SG shifts toward higher temperature with the frequency of an ac magnetic field. In the paramagnetic state, chi exhibits an unusual T dependence due to the formation of a microscopic inhomogeneous magnetic phase. For the x=0.25 sample, both rho and chi show an anomaly at around 110 K due to a charge-ordering transition. Both the x=0.25 and 0.35 samples show large negative magnetoresistance over a wide range of T.