Abstract
Abstract In this work, we have studied structural, electro-magnetic and magnetocaloric properties of La0.7Ba0.3MnO3/xTiO2 manganite/insulator system with 0 ≤ x ≤ 0.08. X-ray diffraction (XRD) shows the coexistence of TiO2 and La0.7Ba0.3MnO3 phases in doped composites through their characteristic peaks. This reveals their interaction lack preserving the R-3c rhombohedral structure for all composites. Due to interaction lack, TiO2 is suggested to segregate at grain boundaries weakening grains connectivity and decreasing metal-semiconductor transition temperature (Tms). The segregated TiO2 hinders conduction between grains leading to carriers tunneling that increases the low field magnetoresistance (LFMR) of La0.7Ba0.3MnO3 from −3% to −3.3, −3.5 and −3.7% for x = 0.02, 0.04 and 0.06 for doped composites. The dc magnetization measurements reveal the constant value of Curie temperature (Tc) and its non impact by doping level referring to the TiO2–La0.7Ba0.3MnO3 interaction lack. Also, the magnetocaloric properties of La0.7Ba0.3MnO3 are enhanced with TiO2 doping, where, the relative cooling power (RCP) of La0.7Ba0.3MnO3 has been enhanced from 35 J/kg to 51, 47, 49 and 50 J/kg for x = 0.02, 0.04, 0.06 and 0.08 composites at 1.5T magnetic field.
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