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We observe an enhanced magnetic entropy change ( DSM) at cryogenic temperatures (T<20 K)\udin Eu8Ga16Ge30 clathrate (type-I) nanocrystals prepared by a ball milling method. With reduction\udin the crystal size to 15 nm,  DSM is enhanced at low temperatures, reaching the highest value\ud( 10 J/kg K) at 5K for a field change of 5 T. For all samples investigated, there is a cross-over temperature\ud( 25 K) in  DSM (T) above which  DSM decreases with crystal size, opposite to that\udobserved at low temperatures. A careful analysis of the magnetic and magnetocaloric data reveals\udthat as the crystal size decreases the magnetic interaction between Eu2þ ions on the Eu2 site governing\udthe primary ferromagnetic transition at  35K becomes gradually weaker, in effect, altering\udthe interaction between Eu2þ ions occupying the Eu1 and Eu2 sites responsible for the secondary\udferromagnetic transition at 15 K. As a result, we have observed a strong change in magnetization\udand the enhancement of  DSM at low temperaturePeer reviewe

Enhanced cryogenic magnetocaloric effect in Eu8Ga16Ge30 clathrate nanocrystals