Enhanced Room Temperature Coefficient of Resistance and Magneto-resistance of Ag-added La0.7Ca0.3-xBaxMnO3 Composites

TL;DR

This study reports enhanced room temperature resistance and magneto-resistance in Ag-added La0.7Ca0.3-xBaxMnO3 composites, promising for sensor applications due to improved TCR and MR properties.

Contribution

The paper introduces Ag addition to La0.7Ca0.3-xBaxMnO3 composites, significantly improving TCR and intra-granular magneto-resistance near room temperature.

Findings

Enhanced TCR close to room temperature.

Increased intra-granular magneto-resistance.

Decreased inter-granular MR with Ag addition.

Abstract

In this paper we report an enhanced temperature coefficient of resistance (TCR) close to room temperature in La0.7Ca0.3-xBaxMnO3 + Agy (x = 0.10, 0.15 and y = 0.0 to 0.40) (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 intra-granular magneto-resistance. Inter-granular MR, however, is seen to decrease with Ag addition. The enhanced TCR and MR at / near room temperature open up the possibility of the use of such materials as infrared bolometric and magnetic field sensors respectively.