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