Synthesis and transport properties of Nd 1-x Sr x CoO 3 composite oxides

The synthesis and transport properties of Nd 1-x Sr x CoO 3 (x=0.30, 0.40, 0.50) composite oxides are investigated in this paper. The cobaltites Nd 1-x Sr x CoO 3 (x=0.30, 0.40, 0.50) samples were prepared in a high temperature by traditional solid state reaction method. The magnetic data show that the system has long range ferromagnetic order in high temperature. The Curie temperature TC increases, the ferromagnetism rapidly increases, and the magnetic curve for x=0.50 samples reaches the maximum. After the transition from paramagnetic to ferromagnetic phase, ferrimagnetic transition occurred at low temperature. Moreover, the transport properties show when Sr content increase, due to the hole introduce, the resistivity of system clearly decreases, reaching the minimum at x=0.5. The transition can be observed from the obvious insulator conductivity to the weak metal conductivity. The peaks of MR are close to the Curie temperature, the maximum is about 17.5%, and the peak value occurred about 175 K for x=0.50. © 2018, AIDIC Servizi S.r.l.