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|Type:||Artigo de evento|
|Title:||Magnetic Polaron And Fermi Surface Effects On The Esr Spin-flip Scattering Of Eub6 Above Tc ≈ 15 K|
|Abstract:||The spin-flip scattering (SFS) between conduction and Eu 2+4f7 (8S7/2) electrons in the paramagnetic phase of EuB6 (T≥TC ≈ 15K) is studied by electron spin resonance (ESR) and magneto-resistance (MR) experiments. The observed Dysonian resonance suggests a metallic environment for the Eu 2+ ions. ESR at high field, H ≅ 12.05kG (v ≅ 33.9 GHz), shows an anisotropic line width with cubic symmetry. ESR at low-field, 1.46kG (4.1 GHz) and 3.35kG (9.5 GHz), shows broader line width and smaller anisotropy than at higher field. The narrowing and anisotropy of the line width at high fields are indicative of a homogeneous resonance where the line width is mainly governed by the SFS mechanism due to the exchange interaction between Eu 2+ 4f7 and conduction electrons. Besides the negative MR, we found an anisotropic MR with cubic symmetry. These results are interpreted in terms of magnetic polaron and Fermi surface effects. © 2004 Elsevier B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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