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Examining the surface phase diagram of IrTe2 with photoemission


Rumo, M; Nicholson, C W; Pulkkinen, A; Hildebrand, B; Kremer, G; Salzmann, B; Mottas, M-L; Ma, K Y; Wong, E L; Man, M K L; Dani, K M; Barbiellini, B; Muntwiler, M; Jaouen, T; von Rohr, Fabian O; Monney, C (2020). Examining the surface phase diagram of IrTe2 with photoemission. Physical review B, 101(23):235120.

Abstract

In the transition metal dichalcogenide IrTe2, low-temperature charge-ordered phase transitions involving Ir dimers lead to the occurrence of stripe phases of different periodicities, and nearly degenerate energies. Bulk-sensitive measurements have shown that, upon cooling, IrTe2 undergoes two such first-order transitions to (5×1×5) and (8×1×8) reconstructed phases at Tc1∼280 K and Tc2∼180 K, respectively. Here, using surface sensitive probes of the electronic structure of IrTe2, we reveal the first-order phase transition at Tc3=165 K to the (6×1) stripes phase, previously proposed to be the surface ground state. This is achieved by combining x-ray photoemission spectroscopy and angle-resolved photoemission spectroscopy, which give access to the evolution of stripe domains and a particular surface state, the energy of which is dependent on the Ir dimer length. By performing measurements over a full thermal cycle, we also report the complete hysteresis of all these phases.

Abstract

In the transition metal dichalcogenide IrTe2, low-temperature charge-ordered phase transitions involving Ir dimers lead to the occurrence of stripe phases of different periodicities, and nearly degenerate energies. Bulk-sensitive measurements have shown that, upon cooling, IrTe2 undergoes two such first-order transitions to (5×1×5) and (8×1×8) reconstructed phases at Tc1∼280 K and Tc2∼180 K, respectively. Here, using surface sensitive probes of the electronic structure of IrTe2, we reveal the first-order phase transition at Tc3=165 K to the (6×1) stripes phase, previously proposed to be the surface ground state. This is achieved by combining x-ray photoemission spectroscopy and angle-resolved photoemission spectroscopy, which give access to the evolution of stripe domains and a particular surface state, the energy of which is dependent on the Ir dimer length. By performing measurements over a full thermal cycle, we also report the complete hysteresis of all these phases.

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Additional indexing

Other titles:Complete surface phase diagram of IrTe2 revealed by photoemission spectroscopy
Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
07 Faculty of Science > Physics Institute
Dewey Decimal Classification:540 Chemistry
Scopus Subject Areas:Physical Sciences > Electronic, Optical and Magnetic Materials
Physical Sciences > Condensed Matter Physics
Language:English
Date:4 June 2020
Deposited On:05 Feb 2021 08:08
Last Modified:06 Feb 2021 21:03
Publisher:American Physical Society
ISSN:2469-9950
OA Status:Green
Publisher DOI:https://doi.org/10.1103/physrevb.101.235120
Project Information:
  • : FunderSNSF
  • : Grant IDPP00P2_170597
  • : Project TitleInvestigating the ultrafast dynamics of Mott correlations

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