The effective Kondo model for a trimer on a metallic surface

Details The effective Kondo model for a trimer on a metallic surface The effective Kondo model for a trimer on a metallic surface

2005-09-19

arxiv.org/abs/cond-mat/0509495v3

Phys. Rev. Lett. 96, 096804 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, to appear in Phys. Rev. Lett. Clarifications on the parameters used were added

Scientific paper

10.1103/PhysRevLett.96.096804

I consider a Hubbard-Anderson model which describes localized orbitals in three different atoms hybridized both among themselves and with a continuum of extended states (ES). Using a generalized Schrieffer-Wolf transformation, I derive an effective Kondo model for the interaction between the doublet ground state of the isolated trimer and the ES. For an isoceles trimer with distances a, l, l between the atoms, the Kondo temperature is negligigle for l < a and has a maximum for finite l > a when a is small. The results agree with experiments for a Cr trimer on Au(111). [T. Jamneala et al., Phys. Rev. Lett. 87, 256804 (2001)].

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