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Origin of the magnetic anomaly and tunneling effect of europium on the ferromagnetic ordering in Eu8-xSrxGa16Ge30 (x = 0,4) type-I clathrates.
dc.creator | Franco García, Victorino | |
dc.creator | Phan, Manh Huong | |
dc.creator | Chaturvedi, Anurag | |
dc.creator | Stefanoski, Stevce | |
dc.creator | Nolas, George S. | |
dc.creator | Srikanth, Hariharan | |
dc.date.accessioned | 2016-01-29T12:40:33Z | |
dc.date.available | 2016-01-29T12:40:33Z | |
dc.date.issued | 2011 | |
dc.identifier.issn | 1098-0121 | es |
dc.identifier.uri | http://hdl.handle.net/11441/33603 | |
dc.description.abstract | Systematic dc magnetization studies using the Banerjee criterion, Kouvel-Fisher, and magnetocaloric effect methods provide physical insights into the origin of themagnetic anomaly and the tunneling effect of europium on the ferromagnetic ordering in Eu8Ga16Ge30 type-I clathrates.We showthat Eu8Ga16Ge30 undergoes a second-order magnetic transition (SOMT) at TC ∼ 35 K, resulting from the magnetic interaction between the Eu2+ ions at the Eu2 sites, followed by a secondary magnetic transition at TL ∼10 K (indicated as amagnetic anomaly in previous studies), as a result of the magnetic interaction between the Eu2+ ions at the Eu1 and Eu2 sites. The critical exponent β = 0.388 is close to that predicted from the three-dimensional Heisenberg model (β = 0.365), while the critical exponent γ = 0.956 is close to that predicted from the mean-field model (γ = 1). The substitution of Sr2+ for Eu2+ retains the SOMT but largely reduces the transition temperatures (TC ∼ 15 K and TL ∼ 5 K), with the critical exponents β = 0.521 and γ = 0.917 close to those predicted from the mean-field model (β = 0.5 and γ = 1). These results point to the important fact that the tunneling of Eu2+ between the four equivalent sites in the tetrakaidecahedral cage tends to prevent the occurrence of a long-range ferromagnetic ordering in the type-I clathrate materials. | es |
dc.format | application/pdf | es |
dc.language.iso | eng | es |
dc.publisher | American Physical Society | es |
dc.relation.ispartof | Physical Review B, 84 (5), 054436 | es |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.title | Origin of the magnetic anomaly and tunneling effect of europium on the ferromagnetic ordering in Eu8-xSrxGa16Ge30 (x = 0,4) type-I clathrates. | 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 | 054436 10.1103/PhysRevB.84.054436 | es |
dc.identifier.doi | http://dx.doi.org/05443610.1103/PhysRevB.84.054436 | es |
dc.identifier.idus | https://idus.us.es/xmlui/handle/11441/33603 |
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