Quantum modulation of the Kondo resonance of Co adatoms on Cu/Co/Cu(100)
Abstract
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.
- Publication:
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arXiv e-prints
- Pub Date:
- April 2008
- DOI:
- 10.48550/arXiv.0804.2967
- arXiv:
- arXiv:0804.2967
- Bibcode:
- 2008arXiv0804.2967U
- Keywords:
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- Condensed Matter - Mesoscopic Systems and Quantum Hall Effect;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 5 pages, Nature of the changes: After our submission, Brovko et al. reported ab initio calculations addressing the exchange interaction of exactly the system we have investigated experimentally (arXiv:0804.3298). We have modified the manuscript to stress the significance of our paper that promises experimental feasibility of such a prediction