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Enhanced cryogenic magnetocaloric effect in Eu8Ga16Ge30 clathrate nanocrystals

AuthorsBiswas, Anis; Chandra, Sayan; Stefanoski, Stevce; Blázquez, J. S.; Ipus, J.J.; Conde Amiano, Alejandro; Phan, M.H.; Franco, V. ; Nolas, S.; Srikanth, H.
Issue Date2015
PublisherAmerican Institute of Physics
CitationJournal of Applied Physics, 117, 033903 (2015)
AbstractWe observe an enhanced magnetic entropy change ( DSM) at cryogenic temperatures (T<20 K) in Eu8Ga16Ge30 clathrate (type-I) nanocrystals prepared by a ball milling method. With reduction in the crystal size to 15 nm, DSM is enhanced at low temperatures, reaching the highest value ( 10 J/kg K) at 5K for a field change of 5 T. For all samples investigated, there is a cross-over temperature ( 25 K) in DSM (T) above which DSM decreases with crystal size, opposite to that observed at low temperatures. A careful analysis of the magnetic and magnetocaloric data reveals that as the crystal size decreases the magnetic interaction between Eu2þ ions on the Eu2 site governing the primary ferromagnetic transition at 35K becomes gradually weaker, in effect, altering the interaction between Eu2þ ions occupying the Eu1 and Eu2 sites responsible for the secondary ferromagnetic transition at 15 K. As a result, we have observed a strong change in magnetization and the enhancement of DSM at low temperature
Publisher version (URL)http://dx.doi.org/10.1063/1.4906280
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