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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|
Holanda, L M
Oseroff, S B
Pagliuso, P G
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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