Signature of spin-phonon coupling driven charge density wave in a kagome magnet

H. Miao (), T. T. Zhang, H. X. Li, G. Fabbris, A. H. Said, R. Tartaglia, T. Yilmaz, E. Vescovo, J.-X. Yin, S. Murakami, X. L. Feng, K. Jiang, X. L. Wu, A. F. Wang (), S. Okamoto (), Y. L. Wang () and H. N. Lee
Additional contact information
H. Miao: Oak Ridge National Laboratory
T. T. Zhang: Tokyo Institute of Technology, Okayama
H. X. Li: Oak Ridge National Laboratory
G. Fabbris: Argonne National Laboratory
A. H. Said: Argonne National Laboratory
R. Tartaglia: Argonne National Laboratory
T. Yilmaz: Brookhaven National Laboratory, Upton
E. Vescovo: Brookhaven National Laboratory, Upton
J.-X. Yin: Southern University of Science and Technology
S. Murakami: Tokyo Institute of Technology, Okayama
X. L. Feng: and Institute of Physics, Chinese Academy of Sciences
K. Jiang: and Institute of Physics, Chinese Academy of Sciences
X. L. Wu: College of Physics and Center of Quantum Materials and Devices, Chongqing University
A. F. Wang: College of Physics and Center of Quantum Materials and Devices, Chongqing University
S. Okamoto: Oak Ridge National Laboratory
Y. L. Wang: University of Science and Technology of China
H. N. Lee: Oak Ridge National Laboratory

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract The intertwining between spin, charge, and lattice degrees of freedom can give rise to unusual macroscopic quantum states, including high-temperature superconductivity and quantum anomalous Hall effects. Recently, a charge density wave (CDW) has been observed in the kagome antiferromagnet FeGe, indicative of possible intertwining physics. An outstanding question is that whether magnetic correlation is fundamental for the spontaneous spatial symmetry breaking orders. Here, utilizing elastic and high-resolution inelastic x-ray scattering, we observe a c-axis superlattice vector that coexists with the 2 $$\times$$ × 2 $$\times$$ × 1 CDW vectors in the kagome plane. Most interestingly, between the magnetic and CDW transition temperatures, the phonon dynamical structure factor shows a giant phonon-energy hardening and a substantial phonon linewidth broadening near the c-axis wavevectors, both signaling the spin-phonon coupling. By first principles and model calculations, we show that both the static spin polarization and dynamic spin excitations intertwine with the phonon to drive the spatial symmetry breaking in FeGe.

Date: 2023
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DOI: 10.1038/s41467-023-41957-5

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