Kondo temperature when the Fermi level is near a step in the conduction density of states

Abstract

The (111) surface of Cu, Ag and Au is characterized by a band of surface Shockley states, with constant density of states beginning slightly below the Fermi energy. These states as well as bulk states hybridize with magnetic impurities which can be placed above the surface. We calculate the characteristic low-temperature energy scale, the Kondo temperature $T_K$ of the impurity Anderson model, as the bottom of the conduction band $D_s$ crosses the Fermi energy ${\epsilon }_F$. We find simple power laws $T_K\simeq |D_s-{\epsilon }_F{|}^{\eta }$, where $\eta$ depends on the sign of $D_s-{\epsilon }_F$, the ratio between surface and bulk hybridizations with the impurity ${\Delta }_s/{\Delta }_b$ and the ratio between on-site and Coulomb energy $E_d/U$ in the model.

10 pages, 7 figures, more discussion and references added, accepted for publication in Phys. Rev. B

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Cited by in corpus (2)

• Width of the charge-transfer peak in the SU(N) impurity Anderson model and its relevance to non-equilibrium transport
• Kondo physics of magnetic adatoms on metallic surfaces when the onset of the surface conduction density of states crosses the Fermi level