Spin density wave and van Hove singularity in the kagome metal CeTi3Bi4

Pyeongjae Park (), Brenden R. Ortiz, Milo Sprague, Anup Pradhan Sakhya, Si Athena Chen, Matthias D. Frontzek, Wei Tian, Romain Sibille, Daniel G. Mazzone, Chihiro Tabata, Koji Kaneko, Lisa M. DeBeer-Schmitt, Matthew B. Stone, David S. Parker, German D. Samolyuk, Hu Miao, Madhab Neupane and Andrew D. Christianson ()
Additional contact information
Pyeongjae Park: Oak Ridge National Laboratory
Brenden R. Ortiz: Oak Ridge National Laboratory
Milo Sprague: University of Central Florida
Anup Pradhan Sakhya: University of Central Florida
Si Athena Chen: Oak Ridge National Laboratory
Matthias D. Frontzek: Oak Ridge National Laboratory
Wei Tian: Oak Ridge National Laboratory
Romain Sibille: PSI Center for Neutron and Muon Sciences
Daniel G. Mazzone: PSI Center for Neutron and Muon Sciences
Chihiro Tabata: Tokai
Koji Kaneko: Tokai
Lisa M. DeBeer-Schmitt: Oak Ridge National Laboratory
Matthew B. Stone: Oak Ridge National Laboratory
David S. Parker: Oak Ridge National Laboratory
German D. Samolyuk: Oak Ridge National Laboratory
Hu Miao: Oak Ridge National Laboratory
Madhab Neupane: University of Central Florida
Andrew D. Christianson: Oak Ridge National Laboratory

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract Kagome metals with van Hove singularities near the Fermi level can host intriguing quantum phenomena such as chiral loop currents, electronic nematicity, and unconventional superconductivity. However, to our best knowledge, unconventional magnetic states driven by van Hove singularities–like spin-density waves–have not been observed experimentally in kagome metals. Here, we report the magnetic and electronic structure of the layered kagome metal CeTi3Bi4, where Ti kagome electronic structure interacts with a magnetic sublattice of Ce3+ Jeff = 1/2 moments. Neutron diffraction reveals an incommensurate spin-density wave ground state of the Ce3+ moments, coexisting with commensurate antiferromagnetic order across most of the temperature-field phase diagram. The commensurate component is preferentially suppressed by thermal fluctuations and magnetic field, yielding a rich phase diagram involving an intermediate single-Q spin-density wave phase. First-principles calculations and angle-resolved photoemission spectroscopy identify van Hove singularities near the Fermi level, with the observed magnetic propagation vectors connecting their high density of states, strongly suggesting a van Hove singularity-assisted spin-density wave. These findings establish kagome metals LnTi3Bi4 as a model platform where the characteristic electronic structure of the kagome lattice plays a pivotal role in magnetic order.

Date: 2025
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DOI: 10.1038/s41467-025-59460-4

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