Effect of Cedoping on structural, magnetic, and transport properties of SrMnO₃ perovskite

Abstract

We have systematically investigated the structural, magnetic, and transport properties of the Sr_{1 − x} Ce_x MnO₃ ( 0 ≤ x ≤ 0.35 ) system as a function of temperature and magnetic field. For x ≥ 0.10 , 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 χ below T_SG decreases and T_SG shifts toward higher temperature with the frequency of an ac magnetic field. In the paramagnetic state, χ exhibits an unusual T dependence due to the formation of a microscopic inhomogeneous magnetic phase. For the x = 0.25 sample, both ρ and χ 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 .