Spontaneous orbital polarization in the nematic phase of FeSe.
Journal
Nature materials
ISSN: 1476-4660
Titre abrégé: Nat Mater
Pays: England
ID NLM: 101155473
Informations de publication
Date de publication:
Aug 2023
Aug 2023
Historique:
received:
26
07
2022
accepted:
19
05
2023
medline:
23
6
2023
pubmed:
23
6
2023
entrez:
22
6
2023
Statut:
ppublish
Résumé
The origin of nematicity in FeSe remains a critical outstanding question towards understanding unconventional superconductivity in proximity to nematic order. To understand what drives the nematicity, it is essential to determine which electronic degree of freedom admits a spontaneous order parameter independent from the structural distortion. Here we use X-ray linear dichroism at the Fe K pre-edge to measure the anisotropy of the 3d orbital occupation as a function of in situ applied stress and temperature across the nematic transition. Along with using X-ray diffraction to precisely quantify the strain state, we reveal a lattice-independent, spontaneously ordered orbital polarization within the nematic phase, as well as an orbital polarizability that diverges as the transition is approached from above. These results provide strong evidence that spontaneous orbital polarization serves as the primary order parameter of the nematic phase.
Identifiants
pubmed: 37349393
doi: 10.1038/s41563-023-01585-2
pii: 10.1038/s41563-023-01585-2
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
985-991Subventions
Organisme : National Science Foundation (NSF)
ID : 1751739
Organisme : National Science Foundation (NSF)
ID : MPS-Ascend Award No. 2138167
Organisme : United States Department of Defense | United States Air Force | AFMC | Air Force Office of Scientific Research (AF Office of Scientific Research)
ID : A9550-19-1-0063
Organisme : DOE | Office of Science (SC)
ID : Contract No. DE-AC02-06CH11357
Informations de copyright
© 2023. The Author(s), under exclusive licence to Springer Nature Limited.
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