Proximity-Induced Superconductivity in a 2D Kondo Lattice of an f-Electron-Based Surface Alloy

Kim, Howon; Morr, Dirk K.; Wiesendanger, Roland

doi:10.1021/acs.nanolett.4c04796

Title: Proximity-Induced Superconductivity in a 2D Kondo Lattice of an f-Electron-Based Surface Alloy

Journal Article · 25 October 2024 · Nano Letters

DOI: https://doi.org/10.1021/acs.nanolett.4c04796 · OSTI ID:2474305

^[1]; Morr, Dirk K. ^[2]; Wiesendanger, Roland ^[3]

University of Hamburg (Germany); Surface and Interface Science Laboratory, Saitama (Japan)
University of Illinois at Chicago, IL (United States)
University of Hamburg (Germany)

Realizing hybrids of low-dimensional Kondo lattices and superconducting substrates leads to fascinating platforms for studying the exciting physics of strongly correlated electron systems with induced superconducting pairing. Here, we report a scanning tunneling microscopy and spectroscopy study of a new type of two-dimensional (2D) La–Ce alloy grown epitaxially on a superconducting Re(0001) substrate. We observe the characteristic spectroscopic signature of a hybridization gap evidencing the coherent spin screening in the 2D Kondo lattice realized by the ultrathin La–Ce alloy film on normal conducting Re(0001). Upon lowering the temperature below the critical temperature of rhenium, a superconducting gap is induced exhibiting an energy asymmetry of the coherence peaks that arises from the interaction of residual unscreened magnetic moments with the superconducting substrate. A positive correlation between the Kondo hybridization gap and the asymmetry of the coherence peaks is found.

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Research Organization:: University of Hamburg (Germany)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-05ER46225

OSTI ID:: 2474305

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 44 Vol. 24; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Proximity-Induced Superconductivity in a 2D Kondo Lattice of an f-Electron-Based Surface Alloy

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