Effect of 'A' and 'B' site substitution in Pr-based manganites: Fundamentals and main properties.

Manganite research has accelerated in recent years, particularly after the discovery of colossal magnetoresistance (CMR). The most fundamental property of these materials is a strong correlation between structure, transport, and magnetic properties. They exhibit extraordinary large magnetoresistance named CMR in the vicinity of the insulator-metal/paramagnetic-ferromagnetic transition at relatively large applied magnetic fields. However, for applied aspects, the occurrence of significant CMR at low applied magnetic fields would be required. This review consists of two sections: In the first section, we have extensively reviewed the salient features, e.g. structure, phase diagram, double-exchange mechanism, Jahn-Teller effect, different types of ordering, and phase separation of CMR manganites. The second is devoted to an overview of experimental results on the effect of low substitution of the rare-earth ion at A-site and Mn-site which is generated interesting, results on their structural, magnetic, and transport properties. [ABSTRACT FROM AUTHOR]