Enhanced room temperature coefficient of resistance and magnetoresistance of Ag-added La_(0.7)Ca_(0.3-x)Ba)xMnO_3 composites

摘要

In this paper we report an enhanced temperature coefficient of resistance (TCR) close to room temperature in La_0.7Ca_(0.3-x)Ba_xMnO_3 + Ag_v(x = 0.10, 0.15 and 0≤y≤1.0) (LCBMO + Ag) composite manganites. The observed enhancement of TCR is attributed to the grain growth and opening of new conducting channels in the composites. Ag addition has also been found to enhance intragranular magnetoresistance.Intergranular MR, however, is seen to decrease with Ag addition. The enhanced TCR and MR atear room temperature open up the possibility of the use of such materials as infrared bolometric and magnetic field sensors, respectively.