Real space manifestations of coherent screening in atomic scale Kondo lattices

María Moro-Lagares, Richard Korytár, Marten Piantek, Roberto Robles, Nicolás Lorente, Jose I. Pascual, M. Ricardo Ibarra and David Serrate ()
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María Moro-Lagares: University of Zaragoza
Richard Korytár: Charles University
Marten Piantek: University of Zaragoza
Roberto Robles: CSIC and BIST, Campus UAB, Bellaterra
Nicolás Lorente: Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU)
Jose I. Pascual: University of Zaragoza
M. Ricardo Ibarra: University of Zaragoza
David Serrate: University of Zaragoza

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract The interaction among magnetic moments screened by conduction electrons drives quantum phase transitions between magnetically ordered and heavy-fermion ground states. Here, starting from isolated magnetic impurities in the Kondo regime, we investigate the formation of the finite size analogue of a heavy Fermi liquid. We build regularly-spaced chains of Co adatoms on a metallic surface by atomic manipulation. Scanning tunneling spectroscopy is used to obtain maps of the Kondo resonance intensity with sub-atomic resolution. For sufficiently small interatomic separation, the spatial distribution of Kondo screening does not coincide with the position of the adatoms. It also develops enhancements at both edges of the chains. Since we can rule out any other interaction between Kondo impurities, this is explained in terms of the indirect hybridization of the Kondo orbitals mediated by a coherent electron gas, the mechanism that causes the emergence of heavy quasiparticles in the thermodynamic limit.

Date: 2019
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DOI: 10.1038/s41467-019-10103-5

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