Ni-Substitution to La0.67Ba0.33Mn1-xNixO3 compounds (x=0; 0.01; 0.02; 0.03; 0.04; and 0.05) andits effect to resistance under magnetic fields

Ni-substituted to perovskites La0.67Ba0.33Mn1-xNixO3 with x = 0; 0.01; 0.02; 0.03; 0.04; and 0.05, have been done and investigated by x-ray diffraction spectrometer, permagraph spectrometer, and four-point probe (FPP) measurements. X-ray diffraction spectrometer result refined by high score software. All samples show an orthorhombic structure at room temperature. At room temperature the cell parameter a, b and c of the samples seem to be constant although the doping of Ni was increased. The permagraph spectrometer results showed that all the samples were paramagnet at room temperature since magnetic remanence is zero for all samples. The four-point probe (FPP) results negative magnetoresistance and positive magnetoresistance. The negative magnetoresistance appears at x = 0 with ratio 15.625% and the positive magnetoresistance appears at x = 0.01 until 0.05 with maximum ratio 18.341% for x = 0.01. Theseevidences showed that highest sensitivity's respond for resistivity change before and after applying external magnetic fields to perform magnetoresistance phenomena is for x = 0.01.