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Type: Artigo de periódico
Title: Absence Of Exchange Interaction Between Localized Magnetic Moments And Conduction-electrons In Magnetic Ions Diluted In Ag-nanoparticles.
Author: Vargas, J M
Iwamoto, W
Holanda, L M
Oseroff, S B
Pagliuso, P G
Rettori, C
Abstract: The Electron Spin Resonance (ESR) of diluted magnetic ions (MI) of Er3+, Yb3+ and Mn2+ in Ag nanoparticles (NPs) is reported. Monodisperse samples of Ag NPs doped with these MI were synthesized by reducing silver nitrate and MI-oxides. This simple method can be extended to all rare-earths. The measurements of the g-values and hyperfine splittings indicates that the MI are located at cubic sites in the Ag:MI NPs. The ESR spectra show that there is no g-shift and Korringa-relaxation due to the exchange interaction between the MI and the conduction electrons, suggesting that the exchange interaction is absent in the Ag:MI NPs. Thus, the nature of this interaction needs to be reexamined at the nanoscale range.
Subject: Colloids
Electric Conductivity
Materials Testing
Particle Size
Rights: fechado
Identifier DOI: 
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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