A case study on polycrystalline monovalent K-doped Lanthanum Manganites has been carried out in context of the electrical conduction mechanisms and their temperature dependence that controls the behavior of mixed valence manganites over an extended temperature range. Studies have also been performed on the thermoelectric power, magnetoresistance and magnetocaloric effect of the compounds. Synthesis of the perovskites by Pyrophoric technique and their microscopic characterizations are detailed. Measurements are done on electrical resistivity, magnetoresistance, thermoelectric power and magnetocaloric effect of the compounds. The results are analyzed in light of various contemporary theoretical propositions.

Soma Das did her B.Tech in Instrumentation & Electronics Engg and Master in Electronics & Telecomm. Engg from Jadavpur University. She did Ph.d. from Cryogenic Engg Center, Indian Institute of Technology, Kharagpur in 2007. Presently she is working as a faculty in Dept Electronics & Comm. Engg., Central University, Bilaspur, C.G.,India.