Abstract
We apply our recently developed, selfconsistent renormalization group (RG) method [] 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 []. 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.
Highlights
The Kondo effect is a genuine many-body phenomenon which, in its usual magnetic manifestation, appears when a magnetic ion is immersed in a non-magnetic host metal
When the temperature is decreased below a characteristic scale, the Kondo temperature TK, the local moment is collectively screened by the conduction electron spins, leading to a narrow resonance in the electronic spectrum and a temperature-independent Pauli susceptibility [3, 4]
In a spin-1/2 two-impurity Kondo (2IK) system, two different ground states are possible, the Kondo state where each of the two local spins forms a Kondo singlet with the conduction electrons, and a dimer state where the two local spins are mutually bound into a singlet or triplet
Summary
The Kondo effect is a genuine many-body phenomenon which, in its usual magnetic manifestation, appears when a magnetic ion is immersed in a non-magnetic host metal. This paper is organized as follows: In section 2, we derive the form of the RKKY interaction for the 1D chain and use the result in section 3 to obtain the Kondo temperature via the RKKYmodified RG.
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