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Title: Absence of exchange interaction between localized magnetic moments and conduction-electrons in diluted Er{sup 3+} gold-nanoparticles

The Electron Spin Resonance (ESR) of diluted Er{sup 3+} 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{sup 3+} g-value along with the observed hyperfine splitting indicate that the Er{sup 3+} impurities are in a local cubic symmetry. Furthermore, the Er{sup 3+} ESR spectra show that the exchange interaction between the 4f and the conduction electrons (ce) is absent or negligible in Au{sub 1–x}Er{sub x} NPs, in contrast to the ESR results in bulk Au{sub 1–x}Er{sub x}. Therefore, the nature of this interaction needs to be reexamined at the nano scale range.
Authors:
;  [1] ;  [1] ;  [2] ;  [3] ;  [1] ;  [2]
  1. Instituto de Física “Gleb Wataghin,” UNICAMP, 13083-859 Campinas, São Paulo (Brazil)
  2. (Brazil)
  3. Centro de Ciências Naturais e Humanas, UFABC, 09210-971 Santo André, São Paulo (Brazil)
Publication Date:
OSTI Identifier:
22273780
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION SPECTRA; ELECTRON SPIN RESONANCE; ELECTRONS; ERBIUM COMPOUNDS; ERBIUM IONS; EXCHANGE INTERACTIONS; G VALUE; GOLD; GOLD COMPOUNDS; MAGNETIC MOMENTS; NANOSTRUCTURES; PARTICLES; PHOSPHINES