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Break of symmetry at the surface of IrTe2 upon phase transition measured by x-ray photoelectron diffraction


Rumo, Maxime; Pulkkinen, Aki; Ma, KeYuan; von Rohr, Fabian O; Muntwiler, Matthias; Monney, Claude (2022). Break of symmetry at the surface of IrTe2 upon phase transition measured by x-ray photoelectron diffraction. Journal of Physics: Condensed Matter, 34(7):075001.

Abstract

IrTe2 undergoes a series of charge-ordered phase transitions below room temperature that are characterized by the formation of stripes of Ir dimers of different periodicities. Full hemispherical x-ray photoelectron diffraction (XPD) experiments have been performed to investigate the atomic position changes undergone near the surface of 1T-IrTe2 in the first-order phase transition, from the (1 × 1) phase to the (5 × 1) phase. Comparison between experiment and simulation allows us to identify the consequence of the dimerization on the Ir atoms local environment. We report that XPD permits to unveil the break of symmetry of IrTe2 trigonal to a monoclinic unit cell and confirm the occurrence of the (5 × 1) reconstruction within the first few layers below the surface with a staircase-like stacking of dimers.

Abstract

IrTe2 undergoes a series of charge-ordered phase transitions below room temperature that are characterized by the formation of stripes of Ir dimers of different periodicities. Full hemispherical x-ray photoelectron diffraction (XPD) experiments have been performed to investigate the atomic position changes undergone near the surface of 1T-IrTe2 in the first-order phase transition, from the (1 × 1) phase to the (5 × 1) phase. Comparison between experiment and simulation allows us to identify the consequence of the dimerization on the Ir atoms local environment. We report that XPD permits to unveil the break of symmetry of IrTe2 trigonal to a monoclinic unit cell and confirm the occurrence of the (5 × 1) reconstruction within the first few layers below the surface with a staircase-like stacking of dimers.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Scopus Subject Areas:Physical Sciences > General Materials Science
Physical Sciences > Condensed Matter Physics
Uncontrolled Keywords:Condensed Matter Physics, General Materials Science
Language:English
Date:16 February 2022
Deposited On:09 Feb 2022 07:52
Last Modified:26 Feb 2024 02:47
Publisher:IOP Publishing
ISSN:0953-8984
OA Status:Green
Publisher DOI:https://doi.org/10.1088/1361-648x/ac3a45
Project Information:
  • : FunderSNSF
  • : Grant IDPP00P2_170597
  • : Project TitleInvestigating the ultrafast dynamics of Mott correlations
  • Content: Accepted Version