Kondo physics of magnetic adatoms on metallic surfaces when the onset of the surface conduction density of states crosses the Fermi level

Article

关键词: RENORMALIZATION-GROUP;    MIRAGES;    MODEL;   

DOI  :  10.1103/PhysRevB.100.165139

来源: SCIE

【 摘 要 】

We study the role of the onset of Shockley states D-s belonging to (111) surfaces of Cu, Ag, and Au in the Kondo effect when a magnetic impurity is deposited on them. When D-s approaches the Fermi level E-F, 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 D-s similar to E-F even in the Kondo regime. As a consequence, the conductance through the impurity is strongly reduced by nearly 25% of the unitary value 2e(2)/h. Finally, we analyze these features in realistic systems like Co on Ag(111) reported in the literature.

【 授权许可】

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