Examining the surface phase diagram of IrTe${}_2$ with photoemission

Abstract

In the transition metal dichalcogenide IrTe${}_2$, 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, IrTe${}_2$ undergoes two such first-order transitions to $(5\times 1\times 5)$ and $(8\times 1\times 8)$ reconstructed phases at $T_{c_1}\sim 280$~K and $T_{c_2}\sim 180$~K, respectively. Here, using surface sensitive probes of the electronic structure of IrTe${}_2$, we reveal the first-order phase transition at $T_{c_3}=165$~K to the $(6\times 1)$ 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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Cited by in corpus (5)

• Observation of a uniaxial strain-induced phase transition in the 2D topological semimetal IrTe${}_2$
• Superconductivity emerging from a stripe charge order in IrTe2 nanoflakes
• Spatially-resolved electronic structure of stripe domains in IrTe${}_2$ through electronic structure microscopy
• Insensitivity of the striped charge-orders in IrTe${}_2$ to alkali surface doping implies their structural origin
• Break of symmetry at the surface of IrTe${}_2$ upon phase transition measured by X-ray photoelectron diffraction