Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 34, Issue 7, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-648X/ac3a45
Keywords
phase transition; x-ray photoelectron diffraction; local real space
Categories
Funding
- Swiss National Science Foundation (SNSF) [P00P2_ 170597]
- Osk. Huttunen Foundation
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In this study, full hemispherical x-ray photoelectron diffraction experiments were used to investigate the atomic position changes near the surface of 1T-IrTe2 during a phase transition. The results revealed a break in symmetry and the formation of a staircase-like stacking of dimers in the surface layers of IrTe2.
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 x 1) phase to the (5 x 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 x 1) reconstruction within the first few layers below the surface with a staircase-like stacking of dimers.
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