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

作者：Lesseux G G^*; Iwamoto W; Garcia Flores A F; Urbano R R; Rettori C

来源：Journal of Applied Physics, 2014, 115(17): 17E128.

DOI：10.1063/1.4867126

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 Er3+ 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 Au1-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.

• 出版日期2014-5-7