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

Miao，H.1; Zhang，T. T.2; Li，H. X.1,3; Fabbris，G.4; Said，A. H.4; Tartaglia，R.4,5; Yilmaz，T.6; Vescovo，E.6; Yin，J. X.7; Murakami，S.2; Feng，X. L.8; Jiang，K.8; Wu，X. L.9; Wang，A. F.9; Okamoto，S.1; Wang，Y. L.10; Lee，H. N.1

2023-12-01

10.1038/s41467-023-41957-5

Nature Communications   影响因子和分区

2041-1723

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 × 2 × 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.

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2-s2.0-85173735538

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1.Materials Science and Technology Division,Oak Ridge National Laboratory,Oak Ridge,United States
2.Department of Physics,Tokyo Institute of Technology,Okayama,Meguro-ku,Tokyo,Japan
3.Advanced Materials Thrust,The Hong Kong University of Science and Technology (Guangzhou),Guangzhou,China
4.Advanced Photon Source,Argonne National Laboratory,Argonne,United States
5.“Gleb Wataghin” Institute of Physics,University of Campinas,Campinas,São Paulo,Brazil
6.National Synchrotron Light Source II,Brookhaven National Laboratory,Upton,New York,United States
7.Laboratory for Quantum Emergence,Department of Physics,Southern University of Science and Technology,Shenzhen,China
8.Beijing National Laboratory for Condensed Matter Physics,and Institute of Physics,Chinese Academy of Sciences,Beijing,China
9.Low Temperature Physics Laboratory,College of Physics and Center of Quantum Materials and Devices,Chongqing University,Chongqing,China
10.School of Emerging Technology,University of Science and Technology of China,Hefei,Anhui,China

Miao，H.,Zhang，T. T.,Li，H. X.,et al. Signature of spin-phonon coupling driven charge density wave in a kagome magnet[J]. Nature Communications,2023,14(1).

Miao，H..,Zhang，T. T..,Li，H. X..,Fabbris，G..,Said，A. H..,...&Lee，H. N..(2023).Signature of spin-phonon coupling driven charge density wave in a kagome magnet.Nature Communications,14(1).

Miao，H.,et al."Signature of spin-phonon coupling driven charge density wave in a kagome magnet".Nature Communications 14.1(2023).