Abstract
We study the role of the onset of Shockley states belonging to (111) surfaces of Cu, Ag, and Au in the Kondo effect when a magnetic impurity is deposited on them. When approaches the Fermi level , which can be done by compressing (stretching) the metallic sample, we find that most of the thermodynamic and dynamic properties of the impurity are affected in a nontrivial way. We model the system by a generic Anderson impurity model and solve it by using the numerical renormalization group technique. In particular, the impurity contribution to magnetic susceptibility and entropy as a function of temperature exhibit negative values and go to zero slowly in a logarithmic shape. Furthermore, we found suppression of the spectral density weight at the Fermi level when even in the Kondo regime. As a consequence, the conductance through the impurity is strongly reduced by nearly of the unitary value . Finally, we analyze these features in realistic systems like Co on Ag(111) reported in the literature.
6 More- Received 16 August 2019
- Revised 3 October 2019
DOI:https://doi.org/10.1103/PhysRevB.100.165139
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