Scientific article
Open access

Examining the surface phase diagram of IrTe2 with photoemission

Published inPhysical review. B, vol. 101, no. 23, 235120
Publication date2020-06-04
First online date2020-06-04

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.

  • Phase diagrams
  • Surface states
  • Transition temperature
  • Angle-resolved photoemission spectroscopy
  • X-ray photoelectron spectroscopy
Affiliation Not a UNIGE publication
Research group
Citation (ISO format)
RUMO, M. et al. Examining the surface phase diagram of IrTe<sub>2</sub> with photoemission. In: Physical review. B, 2020, vol. 101, n° 23, p. 235120. doi: 10.1103/PhysRevB.101.235120
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Article (Published version)
ISSN of the journal2469-9950

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