Oscillation and suppression of Kondo temperature by RKKY coupling in two-site Kondo systems

International Conference on Strongly Correlated Electron Systems 2016

Nejati, Ammar^1 ; Kroha, Johann^1,2

Physikalisches Institut, Bethe Center for Theoretical Physics, Universitat Bonn, Nussallee 12, Bonn

D-53115, Germany^1

Center for Correlated Matter, Zhejiang University, Hangzhou, Zhejiang

310058, China^2

关键词: Antiferromagnetics;    Cobalt atoms;    Kondo temperatures;    One-dimensional chains;    Renormalization group methods;    RKKY coupling;    RKKY interactions;    Ruderman-Kittel-Kasuya-Yosida;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/807/8/082004/pdf
DOI  :  10.1088/1742-6596/807/8/082004

来源: IOP

【 摘 要 】

We apply our recently developed, selfconsistent renormalization group (RG) method [1] to STM spectra of a two-impurity Kondo system consisting of two cobalt atoms connected by a one-dimensional Cu chain on a Cu surface [2]. This RG method was developed to describe local spin screening in multi-impurity Kondo systems in presence of the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction. Using the RKKY interaction of a one-dimensional chain, we explain the experimentally observed suppression and oscillation of the Kondo temperature, TK(y), as a function of the length of the chain and the corresponding RKKY interaction parameter y, regardless of the RKKY coupling being ferromagnetic or antiferromagnetic.