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La0.7Ba0.3MnO3 (LBMO):Agx (x = 0.0, 0.1, 0.2, 0.3, and 0.4) composites aresynthesized by solid-state reaction route, the final sintering temperatures arevaried from 1300 (LBMO1300Ag) to 1400 0C (LBMO1400Ag), and their physicalproperties are compared as a function of temperature and Ag content. Allsamples are crystallized in single phase accompanied by some distortion in mainstructural phase peaks at higher angles with increase in silver content. Thoughthe lattice parameters (a, c) decrease, the b increases slightly with anincrease in Ag content. The scanning electron micrographs (SEM) showed bettergrains morphology in terms of size and diffusion of grain boundaries with anincrease in Ag content. In both LBMO1300Ag and LBMO1400Ag series the metalinsulator transition (TMI) and accompanied paramagnetic-ferromagnetictransition (TC) temperatures are decreased with increase in Ag content. Thesharpness of MI transition, defined by temperature coefficient of resistance(TCR), is improved for Ag added samples. At a particular content of Ag(0.3),the TMI and TC are tuned to 300K and maximum magneto-resistance at 7Teslaapplied field (MR7T) of up to 55% is achieved at this temperature, which ismore than double to that as observed for pure samples of the both 1300 and 14000C series at same temperature. The MR7T is further increased to above 60% forLBMOAg(0.4) samples, but is at 270K. The MR7T is measured at varyingtemperatures of 5, 100, 200, 300, and 400K in varying fields from +/- 7 Tesla,which exhibits U and V type shapes. Summarily, the addition of Ag in LBMOimproves significantly the morphology of the grains and results in betterphysical properties of the parent manganite system.

Impact of silver addition on room temperature magneto-resistance in La0.7Ba0.3MnO3 (LBMO): Agx (x = 0.0, 0.1, 0.2, 0.3, 0.4)