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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.

Opened Access Origin of the magnetic anomaly and tunneling effect of europium on the ferromagnetic ordering in Eu8-xSrxGa16Ge30 (x = 0,4) type-I clathrates.

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Autor: Franco García, Victorino
Phan, Manh Huong
Chaturvedi, Anurag
Stefanoski, Stevce
Nolas, George S.
Srikanth, Hariharan
Departamento: Universidad de Sevilla. Departamento de Física de la Materia Condensada
Fecha: 2011
Publicado en: Physical Review B, 84 (5), 054436
Tipo de documento: Artículo
Resumen: 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), wi...
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Tamaño: 571.6Kb
Formato: PDF

URI: http://hdl.handle.net/11441/33603

DOI: http://dx.doi.org/05443610.1103/PhysRevB.84.054436

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