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Complex oxides represent a class of materials with a plethora of fascinating properties like ferroelectricity, superconductivity, colossal magneto-resistance effect etc. The intriguing interplay of charge, spin and orbital ordering in these systems superimposed by the lattice effects opens a scientifically rewarding playground for both fundamental and application-oriented research. One such class of oxide materials is the perovskite manganites which exhibit large magneto-resistance effect commonly known as colossal magneto-resistance (CMR). In the present work we have studied the substitution effect on various physical properties like electrical resistivity, magneto-transport, AC susceptibility, DC magnetization, thermoelectric power and specific heat of such polycrystalline manganite materials. Manganite materials like Pr0.67Ba0.33MnO3 with large ionic size difference at the rare-earth site have been synthesized and their properties have been compared with the manganites having low ionic size mismatch effect viz. La0.67Ca0.33MnO3 and Pr0.67Sr0.33MnO3.

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Dr. Neeraj Panwar completed his PhD from IIT Delhi, India and Post Doctoral Research from the University of Puerto Rico, USA and University of Aveiro, Portugal. Presently, he is Assistant Professor at the Department of Physics, Central University of Rajasthan, India. He has published about 50 International research papers. He is interested in Yoga.

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