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Type: Artigo de evento
Title: Absence Of Exchange Interaction Between Localized Magnetic Moments And Conduction-electrons In Diluted Er3+ Gold-nanoparticles
Author: Lesseux G.G.
Iwamoto W.
Garcia-Flores A.F.
Urbano R.R.
Rettori C.
Abstract: The Electron Spin Resonance (ESR) of diluted Er3+ magnetic ions in Au nanoparticles (NPs) is reported. The NPs were synthesized by reducing chloro triphenyl-phosphine gold(I) and erbium(III) trifluoroacetate. The Er 3+ g-value along with the observed hyperfine splitting indicate that the Er3+ impurities are in a local cubic symmetry. Furthermore, the Er3+ ESR spectra show that the exchange interaction between the 4f and the conduction electrons (ce) is absent or negligible in Au 1-xErx NPs, in contrast to the ESR results in bulk Au1-xErx. Therefore, the nature of this interaction needs to be reexamined at the nano scale range. © 2014 AIP Publishing LLC.
Editor: American Institute of Physics Inc.
Rights: aberto
Identifier DOI: 10.1063/1.4867126
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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