Direct Observation of Sublattice-Dependent Magnetic Ordering and Strong Electron-Magnon Coupling in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mrow><msub><mrow><mi>Fe</mi></mrow><mrow><mn>5</mn></mrow></msub></mrow><mrow><msub><mrow><mi>GeTe</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></mrow></math>

R. Xu; X. H. Chen; X. L. Li; Y. Z. Wang; J. H. Yao; Z. S. Zhao; S. Liao; S. W. Su; P. Li; Z. T. Liu; D. W. Shen; F. M. Li; Y. L. Wang; D. L. Feng; J. Jiang

doi:10.1103/9t6n-4myf

Direct Observation of Sublattice-Dependent Magnetic Ordering and Strong Electron-Magnon Coupling in ${Fe}_{5} {GeTe}_{2}$

R. Xu ^1,2,*, X. H. Chen ^1,2,*, X. L. Li ^1,2, Y. Z. Wang^1,2, J. H. Yao^1,2, Z. S. Zhao^1,2, S. Liao^1,2, S. W. Su ^1,2, P. Li^1,2 et al.

Z. T. Liu ³, D. W. Shen ⁴, F. M. Li ², Y. L. Wang^1,2,†, D. L. Feng ², and J. Jiang ^1,2,‡

¹Hefei National Research Center for Physical Sciences at Microscale and School of Emerging Technology, University of Science and Technology of China, Hefei 230026, China
²New Cornerstone Science Laboratory, Hefei National Laboratory, Hefei 230088, China
³Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
⁴National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China

^*These authors contributed equally to this work.
^†Contact author: yilinwang@ustc.edu.cn
^‡Contact author: jjiangcindy@ustc.edu.cn

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Phys. Rev. Lett. 136, 256701 – Published 23 June, 2026

DOI: https://doi.org/10.1103/9t6n-4myf

Abstract

The van der Waals room-temperature ferromagnet ${Fe}_{5} {GeTe}_{2}$ has garnered considerable research interest due to its intriguing magnetic and transport properties, as well as its potential applications, yet their microscopic origin remains unclear. Using angle-resolved photoemission spectroscopy and density functional theory calculations, we resolve an electronic structure corresponding to the up-up-up-type configuration. Pronounced Fermi surface reconstruction and a 25 meV dispersion kink referring to the strong electron-magnon coupling have been observed near $T_{1} \sim 105 K$ , coincident with anomalies in resistivity and magnetic susceptibility. Our calculations identify the emergence of Fe(1) sublattice spin order as the driving force behind both phenomena. These findings reveal the decisive role of sublattice-dependent magnetism in governing the coupled electronic and magnetic properties of ${Fe}_{5} {GeTe}_{2}$ , establishing sublattice engineering as a pathway for tuning correlated behavior in two-dimensional magnets.

Physical Review Letters

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Direct Observation of Sublattice-Dependent Magnetic Ordering and Strong Electron-Magnon Coupling in ${Fe}_{5} {GeTe}_{2}$

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Direct Observation of Sublattice-Dependent Magnetic Ordering and Strong Electron-Magnon Coupling in Fe5GeTe2

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Direct Observation of Sublattice-Dependent Magnetic Ordering and Strong Electron-Magnon Coupling in ${Fe}_{5} {GeTe}_{2}$