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Scientific article
English

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

Published inJournal of physics. Condensed matter, vol. 34, no. 7, 075001
Publication date2021-12-01
First online date2021-12-01
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.

eng
Keywords
  • Local real space
  • Phase transition
  • X-ray photoelectron diffraction
Affiliation Not a UNIGE publication
Research group
Citation (ISO format)
RUMO, Maxime et al. Break of symmetry at the surface of IrTe<sub>2</sub> upon phase transition measured by x-ray photoelectron diffraction. In: Journal of physics. Condensed matter, 2021, vol. 34, n° 7, p. 075001. doi: 10.1088/1361-648X/ac3a45
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ISSN of the journal0953-8984
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