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Strongly Entangled Kondo and Kagome Lattices and the Emergent Magnetic Ground State in Heavy-Fermion Kagome Metal YbV6Sn6

Rui Lou1,2,3,*, Max Mende4, Riccardo Vocaturo1, Hao Zhang5, Qingxin Dong6,7, Man Li8,†, Pengfei Ding9, Erjian Cheng10,‡, Zhiguang Liao9 et al.

Yu Zhang9, Junfa Lin9, Reza Firouzmandi1, Vilmos Kocsis1, Laura T. Corredor1, Yurii Prots10, Oleksandr Suvorov1, Anupam Jana11,12, Jun Fujii11, Ivana Vobornik11, Oleg Janson1, Wenliang Zhu5,13,§, Jeroen van den Brink1,14, Cornelius Krellner15, Minghu Pan5,16, Bosen Wang6,7, Tianlong Xia9, Jinguang Cheng6,7, Shancai Wang9, Claudia Felser10, Bernd Büchner1,4, Sergey Borisenko1, Rong Yu9, Denis V. Vyalikh17,18,∥, and Alexander Fedorov1,2,3,¶

  • *Contact author: lourui09@gmail.com
  • †Contact author: lmrucphys@ruc.edu.cn
  • ‡Contact author: Erjian.Cheng@cpfs.mpg.de
  • §Contact author: wlzhu@snnu.edu.cn
  • ∥Contact author: denis.vyalikh@dipc.org
  • Contact author: a.fedorov@ifw-dresden.de
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Phys. Rev. Lett. 135, 146902 – Published 30 September, 2025

DOI: https://doi.org/10.1103/sqbn-vtcj

Abstract

Applying angle-resolved photoemission spectroscopy and density functional theory calculations, we present compelling spectroscopic evidence demonstrating the intertwining and mutual interaction between the Kondo and kagome sublattices in heavy-fermion intermetallic compound YbV6Sn6. We reveal the Yb 4f-derived states near the Fermi level, along with the presence of bulk kagome bands and topological surface states. We unveil strong interactions between the 4f and itinerant electrons, where the kagome bands hosting the Dirac fermions and van Hove singularities predominate. Such findings are well described using a c−f hybridization model. On the other hand, our systematic characterization of magnetic properties demonstrates an unusually enhanced antiferromagnetic ordering, where the kagome-derived van Hove singularities near EF play a vital role in determining the unconventional nature of the Ruderman-Kittel-Kasuya-Yosida interaction and Kondo coupling. These unique kagome-state-mediated exchange interactions have never been reported before and could lead to a novel phase diagram and various quantum critical behaviors in YbV6Sn6 and its siblings. Our results not only expand the family of exotic quantum phases entangled with kagome structure to the strongly correlated regime, but also establish YbV6Sn6 as an unprecedented platform to explore unconventional many-body physics beyond the standard Kondo picture.

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Phys. Rev. Lett. 135, 146902– Published 30 September, 2025
  • Received 15 December 2023
  • Revised 1 August 2025
  • Accepted 4 September 2025
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