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$La_{0.7}Ca_{0.3}MnO_3$ samples were prepared in nano- and polycrystallineforms by sol-gel and solid state reaction methods, respectively, andstructurally characterized by synchrotron X-ray diffraction. The magneticproperties determined by ac susceptibility and dc magnetization measurementsare discussed. The magnetocaloric effect in this nanocrystalline manganite isspread over a broader temperature interval than in the polycrystalline case.The relative cooling power of the poly- and nanocrystalline manganites is usedto evaluate a possible application for magnetic cooling below room temperature.

Magnetocaloric effect in nano- and polycrystalline manganite $La_{0.7}Ca_{0.3}MnO_3$