ELECTRICAL-MAGNETIC PROPERTIES OF (1-x)La0.7 Ca0.3MnO3 + xLa1.5Sr0.5NiO4 NANOCOMPOSITES

Abstract

In this report, we present the synthesis and electrical-magnetic properties of (1-x)La₀.₇Ca₀.₃MnO₃ +  xLa₁.₅Sr₀.₅NiO₄  nanocomposites with 0  ≤  x  ≤0.4. The nanocomposites were synthesized by reactive milling method combining with a heat treatment. The Curie temperature is almost independent of  x. The metal-insulator transition temperature shiftsfrom 254 K for x  = 0.0 to 65 K for  x= 0.2. For  x  ≥0.25, the electrical conductivity of the nanocomposites is insulating in the temperature range from 30 K to 300 K. The resistivity of all the samples increases with increasing  x. The presence of the dielectric phase La₁.₅Sr₀.₅NiO₄ decreased the value of Magnetoresistance near TC but increased the value of the Low Field Magnetoresistance below TC