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Yu-Shiba-Rusinov bands in a self-assembled kagome lattice of magnetic molecules

Author

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  • Laëtitia Farinacci

    (Freie Universität Berlin)

  • Gaël Reecht

    (Freie Universität Berlin)

  • Felix Oppen

    (Freie Universität Berlin)

  • Katharina J. Franke

    (Freie Universität Berlin)

Abstract

Kagome lattices constitute versatile platforms for studying paradigmatic correlated phases. While molecular self-assembly of kagome structures on metallic substrates is promising, it is challenging to realize pristine kagome properties because of hybridization with the bulk degrees of freedom and modified electron-electron interactions. We suggest that a superconducting substrate offers an compelling platform for realizing a magnetic kagome lattice. Exchange coupling induces kagome-derived bands at the interface, which are protected from the bulk by the superconducting energy gap. We realize a magnetic kagome lattice on a superconductor by depositing Fe-porphin-chloride molecules on Pb(111) and using temperature-activated de-chlorination and self-assembly. This allows us to control the formation of smaller kagome precursors and long-range ordered kagome islands. Using scanning tunneling microscopy and spectroscopy at 1.6 K, we identify Yu-Shiba-Rusinov states inside the superconducting energy gap and track their hybridization from the precursors to larger islands, where the kagome lattice induces extended YSR bands. These YSR-derived kagome bands inside the superconducting energy gap allow for long-range coupling and induced pairing correlations, motivating further studies to resolve possible spin-liquid or Kondo-lattice-type behavior.

Suggested Citation

  • Laëtitia Farinacci & Gaël Reecht & Felix Oppen & Katharina J. Franke, 2024. "Yu-Shiba-Rusinov bands in a self-assembled kagome lattice of magnetic molecules," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50829-5
    DOI: 10.1038/s41467-024-50829-5
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    References listed on IDEAS

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    1. Tian-Heng Han & Joel S. Helton & Shaoyan Chu & Daniel G. Nocera & Jose A. Rodriguez-Rivera & Collin Broholm & Young S. Lee, 2012. "Fractionalized excitations in the spin-liquid state of a kagome-lattice antiferromagnet," Nature, Nature, vol. 492(7429), pages 406-410, December.
    2. Satoru Nakatsuji & Naoki Kiyohara & Tomoya Higo, 2015. "Large anomalous Hall effect in a non-collinear antiferromagnet at room temperature," Nature, Nature, vol. 527(7577), pages 212-215, November.
    3. Jia-Xin Yin & Biao Lian & M. Zahid Hasan, 2022. "Topological kagome magnets and superconductors," Nature, Nature, vol. 612(7941), pages 647-657, December.
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