Absence of exchange interaction between localized magnetic moments and conduction-electrons in diluted Er3+ gold-nanoparticles

G. G. Lesseux, W. Iwamoto, A. F. García-Flores, R. R. Urbano, C. Rettori
2014 Journal of Applied Physics  
The Electron Spin Resonance (ESR) of diluted Er 3þ 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 3þ g-value along with the observed hyperfine splitting indicate that the Er 3þ impurities are in a local cubic symmetry. Furthermore, the Er 3þ ESR spectra show that the exchange interaction between the 4f and the conduction electrons (ce) is absent or negligible in Au 1-x Er x
more » ... in Au 1-x Er x NPs, in contrast to the ESR results in bulk Au 1-x Er x . Therefore, the nature of this interaction needs to be reexamined at the nano scale range. V C 2014 AIP Publishing LLC.
doi:10.1063/1.4867126 fatcat:pwmana2bergrllzrbh2tyghmom