Quantum modulation of the Kondo resonance of Co adatoms on Cu/Co/Cu(100)

Details Quantum modulation of the Kondo resonance of Co adatoms on Cu/Co/Cu(100) Quantum modulation of the Kondo resonance of Co adatoms on Cu/Co/Cu(100)

2008-04-18

arxiv.org/abs/0804.2967v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, Nature of the changes: After our submission, Brovko et al. reported ab initio calculations addressing the exchange in

Scientific paper

Low-temperature scanning tunneling spectroscopy reveals that the Kondo temperature T_K of Co atoms adsorbed on Cu/Co/Cu(100) multilayers varies between 60 K and 134 K as the Cu film thickness decreases from 20 to 5 atomic layers. The observed change of T_K is attributed to a variation of the density of states at the Fermi level \rho_F induced by quantum well states confined to the Cu film. A model calculation based on the quantum oscillations of \rho_F at the belly and the neck of the Cu Fermi surface reproduces most of the features in the measured variation of T_K.

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