Synthesis and Experimental Study of Structure, Magnetotransport Properties and Temperature Coefficient of Resistance of $${\text{La}}_{0.7} {\text{Ca}}_{0.18} {\text{Ba}}_{0.12} {\text{Mn}}_{0.95} {\text{Sn}}_{0.05} {\text{O}}_{3}$$ La 0.7 Ca 0.18 Ba 0.12 Mn 0.95 Sn 0.05 O 3 Manganite

$${\text{La}}_{0.7} {\text{Ca}}_{0.18} {\text{Ba}}_{0.12} {\text{Mn}}_{0.95} {\text{Sn}}_{0.05} {\text{O}}_{{3{ }}}$$ compound has been successfully prepared by the solid-state reaction route. The structural, electrical, magnetotransport properties, as well as the temperature coefficient of resistance, were experimentally characterized and discussed. Rietveld’s refinement of the X-ray diffractogram revealed that the compound crystallizes in an orthorhombic structure with a Pnma space group. The estimated crystallite size is about 43 nm. The SEM micrographs revealed the granular nature and polygonal grain shape of the sample. The electrical resistivity curves, carried out between 20 and 300 K, show a metal-to-insulator transition and an upturn at a very low-temperature range (20 K < T < 32 K). The magnetoresistance maximum value reached 23.23% at 20 K under 1 Tesla. The temperature coefficient of resistance curves exhibits a slight characteristic peak around TMI, and its value is around 1.96%. Fitting the electrical resistivity curves in the metallic region ( $$32\;{\text{K}} < T \le T_{{{\text{MI}}}}$$ ) confirms that the resistivity behavior is governed by a combination of residual resistivity, electron–electron scattering process, and electron–phonon interaction, whereas in the insulating region ( $$T \ge \theta_{D} /2$$ ), it is governed by adiabatical small polarons hopping.