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  • Letter
  • Open Access

Competing phases in the kagome magnet FeGe from functional renormalization

Pietro M. Bonetti1,2, Yi Jiang3, Haoyu Hu4, Dumitru Călugăru4, Michael M. Scherer5, B. Andrei Bernevig3,4,6, and Laura Classen2,7

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Phys. Rev. B 112, L220405 – Published 2 December, 2025

DOI: https://doi.org/10.1103/2j4h-gptn

Abstract

The discovery of a charge density wave in FeGe extends the discussion of the nature of charge order in kagome metals to a magnetic compound. Motivated by this observation, we combine density functional theory (DFT) and functional-renormalization-group calculations to study interaction-induced Fermi-surface instabilities of the magnetic state of FeGe. We argue that the leading intra-band contribution to electronic correlations are approximately two-dimensional (2D) and come from Van Hove points at the projected M points. By varying parameters around DFT values, we determine a phase diagram for the quasi-2D scenario as function of on-site and nearest-neighbor interactions. We discuss universal aspects in the electronic mechanisms for the resulting phases, as well as the role of SU(2) symmetry breaking. We find FeGe to be in a regime of strong competition between p-wave charge density wave, f-wave pairing, and d-wave spin Pomeranchuk instabilities. This interplay can be influenced in favor of superconducting pairing for slightly increased nearest-neighbor interaction, suggesting a potential to induce superconductivity in FeGe.

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Phys. Rev. B 112, L220405– Published 2 December, 2025
  • Received 29 November 2024
  • Revised 17 June 2025
  • Accepted 7 November 2025
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