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We demonstrate the possibility of enhancing both the magnetocaloric effect MCE  and refrigerant capacity RC  in nanostructured mixed phase manganites. A comparative study of the magnetic and magnetocaloric properties of La0.35Pr0.275Ca0.375MnO3 in single crystalline and nanocrystalline forms is presented. While the conventional trend is reduction of magnetization and MCE with nanostructuring, we show that the opposite is true in the case of mixed phase manganites. The charge-ordered state is largely suppressed and ferromagnetic order is established in the nanocrystalline sample with an average particle size of 50 nm. Consequently, a strong enhancement of MCE and RC and a strong reduction of thermal and field hysteresis losses are achieved in the nanocrystalline sample. This finding opens up a way of exploring magnetic refrigerant materials at the nanometer scale for active magnetic refrigerators. © 2010 American Institute of Physics. doi:10.1063/1.3526380 Magnetic refrigeration is a cooling technology based on the magnetocaloric effect MCE.1 It has several advantages e.g., higher efficiency, compactness, and environmental safety  over conventional gas compression techniques. Cur

Collapse of charge ordering and enhancement of magnetocaloric effect in nanocrystalline La0.35Pr0.275Ca0.375MnO3