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Enhanced cryogenic magnetocaloric effect in Eu8Ga16Ge30 clathrate nanocrystals
dc.creator | Biswas, Anis | |
dc.creator | Chandra, Sayan Rout | |
dc.creator | Stefanoski, S. | |
dc.creator | Blázquez Gámez, Javier Sebastián | |
dc.creator | Ipus Bados, Jhon Jairo | |
dc.creator | Conde Amiano, Alejandro | |
dc.creator | Phan, Manh Huong | |
dc.creator | Franco García, Victorino | |
dc.creator | Nolas, George S. | |
dc.creator | Srikanth, Hariharan | |
dc.date.accessioned | 2016-02-01T10:35:41Z | |
dc.date.available | 2016-02-01T10:35:41Z | |
dc.date.issued | 2015 | |
dc.identifier.issn | 0021-8979 | es |
dc.identifier.uri | http://hdl.handle.net/11441/33671 | |
dc.description.abstract | We observe an enhanced magnetic entropy change ( D S M ) at cryogenic temperatures (T < 20 K) in Eu 8 Ga 16 Ge 30 clathrate (type-I) nanocrystals prepared by a ball milling method. With reduction in the crystal size to 15 nm, D S M is enhanced at low temperatures, reaching the highest value ( 10 J/kg K) at 5 K for a field change of 5 T. For all samples investigated, there is a cross-over tem- perature ( 25 K) in D S M (T) above which D S M 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 Eu 2 þ ions on the Eu2 site gov- erning the primary ferromagnetic transition at 35 K becomes gradually weaker, in effect, altering the interaction between Eu 2 þ 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 D S M at low temperature. | es |
dc.format | application/pdf | es |
dc.language.iso | eng | es |
dc.publisher | AIP Publishing | es |
dc.relation.ispartof | Journal of Applied Physics, 117 (033903) | es |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.subject | Cryogenic temperatures | es |
dc.subject | Ferromagnetic transitions | es |
dc.subject | Magnetocaloric | es |
dc.subject | Nanocrystals | es |
dc.title | Enhanced cryogenic magnetocaloric effect in Eu8Ga16Ge30 clathrate nanocrystals | es |
dc.type | info:eu-repo/semantics/article | es |
dcterms.identifier | https://ror.org/03yxnpp24 | |
dc.type.version | info:eu-repo/semantics/publishedVersion | es |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es |
dc.contributor.affiliation | Universidad de Sevilla. Departamento de Física de la Materia Condensada | es |
dc.relation.publisherversion | 10.1063/1.4906280 | es |
dc.identifier.doi | http://dx.doi.org/10.1063/1.4906280 | es |
dc.identifier.idus | https://idus.us.es/xmlui/handle/11441/33671 |
Ficheros | Tamaño | Formato | Ver | Descripción |
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Enhanced cryogenic.pdf | 1.176Mb | [PDF] | Ver/ | |