Scanning tunneling spectroscopic evidence of crossover transition in the two-impurity Kondo problem

SURFACE SCIENCE

卷:604

Article

Minamitani, Emi¹  Dino, Wilson Agerico¹  Nakanishi, Hiroshi¹  Kasai, Hideaki¹ 

[1] Osaka Univ, Dept Precis Sci & Technol & Appl Phys, Suita, Osaka 5650871, Japan

关键词: Metal surface;    Scanning tunneling spectroscopy;    Numerical renormalization group;    Two-impurity Kondo effect;   

DOI  :  10.1016/j.susc.2010.09.005

来源: Elsevier

【 摘 要 】

To explore the crossover transition in the two-Impurity Kondo problem we calculate the differential conductance (dI/dV) corresponding to scanning tunneling spectroscopy (STS) measurements of a magnetic dimer adsorbed on a metal surface covered by a decoupling layer With the aid of the numerical renormalization group (NRG) technique we find that the peak structure of the dI/dV spectra near the Fermi level changes gradually as a function of the adatom separation and the coupling between the adatom localized spins and the metal surface conduction band When the coupling becomes small the peak disappears and instead a dip structure appears near the Fermi level This dip structure is the manifestation of the strong antiferromagnenc correlation between the localized spins We conclude that the gradual change of the dI/dV structure from a peak structure to a dip structure is an evidence of the crossover transition in the two-impurity Kondo problem (C) 2010 Elsevier B V All rights reserved

【 授权许可】

Free