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PreprintCC BY 4.0arXiv

Coexisting Kondo and Weyl-like transport in kagome heavy-fermion metal, YbyCo3Ge3−xSnx

  • M. P. Dubbelman
  • R. Meduri
  • T. M. Kyrk
  • Z. Cheng
  • P. Maderson
  • D. Pizzirani
  • A. Das
  • V. N. Vreede
  • X. Liu
  • N. Witt
  • S. Grytsiuk
  • C. M. Polley
8 more authors
  • M. Rösner
  • A. Grubišić-Čabo
  • S. Bhattacharyya
  • R. E. Baumbach
  • M. E. Kamminga
  • S. Wiedmann
  • J. Y. Chan
  • M. N. Ali
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Abstract

Strong electron correlations and topology offer complementary routes to controlling electrical conduction, as correlations can make electrons heavy (e.g. Kondo lattices) whereas topology can make them behave as massless particles (e.g. Dirac or Weyl systems), and having both in one material is rare. In Kondo lattice systems, Kondo hybridization between localized 4f and conduction electrons strongly enhances the quasiparticle mass, where in Weyl-Kondo systems these Kondo-renormalized bands form Weyl states, and simultaneous signs of both Kondo and Weyl states in one material have not been observed in transport. Here we report signs of both in the kagome metal \ce{Yb_yCo3Ge_{3-x}Sn_x} by combining magnetotransport, heat capacity, magnetization, angle-resolved and X-ray photoemission spectroscopy, and DFT+U calculations to reveal Yb-dependent Kondo scattering developing into lattice coherence, with extrapolated Sommerfeld coefficient of approximately 2 ~JmolYb−1K−2. Transverse magnetoresistance (MR) follows single-ion Kondo scaling, whereas longitudinal transport contains an additional negative response proportional to B2 and remains unsaturated up to 32 T, consistent with a chiral anomaly. These findings support a picture of Kondo and Weyl-like conduction arising from distinct electronic states without external Fermi-level tuning, suggesting a possible route to combining correlated and topological functionality in a bulk material.

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Cite

BibTeXRIS
BibTeX
@misc{dubbelman2026coexisting,
  title = {{Coexisting Kondo and Weyl-like transport in kagome heavy-fermion metal, Yb$_y$Co$_3$G$e_3-x$Sn$_x$}},
  author = {M. P. Dubbelman and R. Meduri and T. M. Kyrk and Z. Cheng and P. Maderson and D. Pizzirani and A. Das and V. N. Vreede and X. Liu and N. Witt and S. Grytsiuk and C. M. Polley and M. Rösner and A. Grubišić-Čabo and S. Bhattacharyya and R. E. Baumbach and M. E. Kamminga and S. Wiedmann and J. Y. Chan and M. N. Ali},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.03822},
  eprint = {2611.03822},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.03822},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Coexisting Kondo and Weyl-like transport in kagome heavy-fermion metal, Yb_yCo_3Ge_3−xSn_x
AU  - M. P. Dubbelman
AU  - R. Meduri
AU  - T. M. Kyrk
AU  - Z. Cheng
AU  - P. Maderson
AU  - D. Pizzirani
AU  - A. Das
AU  - V. N. Vreede
AU  - X. Liu
AU  - N. Witt
AU  - S. Grytsiuk
AU  - C. M. Polley
AU  - M. Rösner
AU  - A. Grubišić-Čabo
AU  - S. Bhattacharyya
AU  - R. E. Baumbach
AU  - M. E. Kamminga
AU  - S. Wiedmann
AU  - J. Y. Chan
AU  - M. N. Ali
PY  - 2026
DA  - 2026/11/02
PB  - arXiv
DO  - 10.48550/arxiv.2611.03822
UR  - https://arxiv.org/abs/2611.03822
AB  - Strong electron correlations and topology offer complementary routes to controlling electrical conduction, as correlations can make electrons heavy (e.g. Kondo lattices) whereas topology can make them behave as massless particles (e.g. Dirac or Weyl systems), and having both in one material is rare. In Kondo lattice systems, Kondo hybridization between localized 4f and conduction electrons strongly enhances the quasiparticle mass, where in Weyl-Kondo systems these Kondo-renormalized bands form Weyl states, and simultaneous signs of both Kondo and Weyl states in one material have not been observed in transport. Here we report signs of both in the kagome metal \ce{Yb_yCo3Ge_{3-x}Sn_x} by combining magnetotransport, heat capacity, magnetization, angle-resolved and X-ray photoemission spectroscopy, and DFT+U calculations to reveal Yb-dependent Kondo scattering developing into lattice coherence, with extrapolated Sommerfeld coefficient of approximately 2 ~Jmol_Yb^−1K^−2. Transverse magnetoresistance (MR) follows single-ion Kondo scaling, whereas longitudinal transport contains an additional negative response proportional to B^2 and remains unsaturated up to 32 T, consistent with a chiral anomaly. These findings support a picture of Kondo and Weyl-like conduction arising from distinct electronic states without external Fermi-level tuning, suggesting a possible route to combining correlated and topological functionality in a bulk material.
ER  -