Examining the surface phase diagram of IrTe2 with photoemission
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 Tc 2∼180 K, respectively. Here, using surface sensitive probes of the electronic structure of IrTe2, we reveal the first-order phase transition at Tc 3=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.
- Publication:
-
Physical Review B
- Pub Date:
- June 2020
- DOI:
- 10.1103/PhysRevB.101.235120
- arXiv:
- arXiv:1912.04516
- Bibcode:
- 2020PhRvB.101w5120R
- Keywords:
-
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- Phys. Rev. B 101, 235120 (2020)