Competing itinerant and local spin interactions in kagome metal FeGe

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dc.contributor.authorChen, LBen_AU
dc.contributor.authorTeng, XOen_AU
dc.contributor.authorTan, HXen_AU
dc.contributor.authorWinn, BLen_AU
dc.contributor.authorGranroth, GEen_AU
dc.contributor.authorYe, Fen_AU
dc.contributor.authorYu, DHen_AU
dc.contributor.authorMole, RAen_AU
dc.contributor.authorGao, Ben_AU
dc.contributor.authorYan, BHen_AU
dc.contributor.authorYi, Men_AU
dc.contributor.authorDai, PCen_AU
dc.date.accessioned2025-04-04T04:19:07Zen_AU
dc.date.available2025-04-04T04:19:07Zen_AU
dc.date.issued2024-03en_AU
dc.date.statistics2024-09-25en_AU
dc.description.abstractThe combination of a geometrically frustrated lattice, and similar energy scales between degrees of freedom endows two-dimensional Kagome metals with a rich array of quantum phases and renders them ideal for studying strong electron correlations and band topology. The Kagome metal, FeGe is a noted example of this, exhibiting A-type collinear antiferromagnetic (AFM) order at TN ≈ 400 K, then establishes a charge density wave (CDW) phase coupled with AFM ordered moment below TCDW ≈ 110 K, and finally forms a c-axis double cone AFM structure around TCanting ≈ 60 K. Here we use neutron scattering to demonstrate the presence of gapless incommensurate spin excitations associated with the double cone AFM structure of FeGe at temperatures well above TCanting and TCDW that merge into gapped commensurate spin waves from the A-type AFM order. Commensurate spin waves follow the Bose factor and fit the Heisenberg Hamiltonian, while the incommensurate spin excitations, emerging below TN where AFM order is commensurate, start to deviate from the Bose factor around TCDW, and peaks at TCanting. This is consistent with a critical scattering of a second order magnetic phase transition with decreasing temperature. By comparing these results with density functional theory calculations, we conclude that the incommensurate magnetic structure arises from the nested Fermi surfaces of itinerant electrons and the formation of a spin density wave order. © The Author(s) 2024 - Open Access CC 4.0en_AU
dc.description.sponsorshipThe neutron scattering and single-crystal synthesis work at Rice was supported by US NSF-DMR-2100741 and by the Robert A. Welch Foundation under grant no. C-1839, respectively (P.D.). M.Y. acknowledges support by the U.S. DOE grant No. DE-SC0021421 and the Robert A. Welch Foundation, Grant No. C-2175. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by Oak Ridge National Laboratory. The access of Pelican instrument at ANSTO (P17255) is gratefully acknowledged. B.Y. acknowledges the financial support by the European Research Council (ERC Consolidator Grant “NonlinearTopo”, No. 815869) and the ISF - Personal Research Grant (No. 2932/21).en_AU
dc.format.mediumElectronicen_AU
dc.identifier.articlenumber1918en_AU
dc.identifier.citationChen, L., Teng, X., Tan, H., Winn, B. L., Granroth, G. E., Ye, F., Yu, D. H., Mole, R. A., Gao, B., Yan, B., Yi, M., & Dai, P. (2024). Competing itinerant and local spin interactions in kagome metal FeGe. Nature Communications, 15(1), 1918. doi:10.1038/s41467-023-44190-2en_AU
dc.identifier.issn2041-1723en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleNature Communicationsen_AU
dc.identifier.urihttps://doi.org/10.1038/s41467-023-44190-2en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/16132en_AU
dc.identifier.volume15en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherSpringer Natureen_AU
dc.subjectGermaniumen_AU
dc.subjectIronen_AU
dc.subjectSpinen_AU
dc.subjectInteractionsen_AU
dc.subjectMetalsen_AU
dc.subjectElectronsen_AU
dc.subjectCorrelationsen_AU
dc.subjectAntiferromagnetic materialsen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectCrystal latticesen_AU
dc.subjectMaterialsen_AU
dc.titleCompeting itinerant and local spin interactions in kagome metal FeGeen_AU
dc.typeJournal Articleen_AU
dcterms.dateAccepted2023-12-04en_AU
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