Anomalous electrons in a metallic kagome ferromagnet
dc.contributor.author
Ekahana, Sandy A.
dc.contributor.author
Soh, Y.
dc.contributor.author
Tamai, Anna
dc.contributor.author
Gosálbez-Martínez, Daniel
dc.contributor.author
Yao, Mengyu
dc.contributor.author
Hunter, Andrew
dc.contributor.author
Fan, Wenhui
dc.contributor.author
Wang, Yihao
dc.contributor.author
Li, Junbo
dc.contributor.author
Kleibert, Armin
dc.contributor.author
Vaz, Carlosaf Antonio Fernandes
dc.contributor.author
Ma, Junzhang
dc.contributor.author
Lee, Hyungjun
dc.contributor.author
Xiong, Yimin
dc.contributor.author
Yazyev, Oleg V.
dc.contributor.author
Baumberger, Felix
dc.contributor.author
Shi, Ming
dc.contributor.author
Aeppli, Gabriel
dc.date.accessioned
2024-03-27T16:23:31Z
dc.date.available
2024-03-26T07:17:34Z
dc.date.available
2024-03-27T16:23:31Z
dc.date.issued
2024-03-07
dc.identifier.issn
0028-0836
dc.identifier.issn
1476-4687
dc.identifier.other
10.1038/s41586-024-07085-w
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/666101
dc.identifier.doi
10.3929/ethz-b-000666101
dc.description.abstract
Ordinary metals contain electron liquids within well-defined ‘Fermi’ surfaces at which the electrons behave as if they were non-interacting. In the absence of transitions to entirely new phases such as insulators or superconductors, interactions between electrons induce scattering that is quadratic in the deviation of the binding energy from the Fermi level. A long-standing puzzle is that certain materials do not fit this ‘Fermi liquid’ description. A common feature is strong interactions between electrons relative to their kinetic energies. One route to this regime is special lattices to reduce the electron kinetic energies. Twisted bilayer graphene1–4 is an example, and trihexagonal tiling lattices (triangular ‘kagome’), with all corner sites removed on a 2 × 2 superlattice, can also host narrow electron bands5 for which interaction effects would be enhanced. Here we describe spectroscopy revealing non-Fermi-liquid behaviour for the ferromagnetic kagome metal Fe3Sn2 (ref. 6). We discover three C3-symmetric electron pockets at the Brillouin zone centre, two of which are expected from density functional theory. The third and most sharply defined band emerges at low temperatures and binding energies by means of fractionalization of one of the other two, most likely on the account of enhanced electron–electron interactions owing to a flat band predicted to lie just above the Fermi level. Our discovery opens the topic of how such many-body physics involving flat bands7,8 could differ depending on whether they arise from lattice geometry or from strongly localized atomic orbitals9,10.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Nature
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.title
Anomalous electrons in a metallic kagome ferromagnet
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2024-03-06
ethz.journal.title
Nature
ethz.journal.volume
627
en_US
ethz.journal.issue
8002
en_US
ethz.pages.start
67
en_US
ethz.pages.end
72
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.scopus
ethz.publication.status
published
en_US
ethz.date.deposited
2024-03-26T07:17:37Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2024-03-27T16:23:33Z
ethz.rosetta.lastUpdated
2024-03-27T16:23:33Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
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