Phase transition in IrTe2 induced by spin-orbit coupling

Koley, S.

doi:10.1016/j.ssc.2016.08.015

Cited by 6 publications

(4 citation statements)

References 42 publications

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“…IrTe 2 undergoes a first-order structural phase transition at T c 1 ∼ 280 K from a trigonal CdI 2 -type (P3m1) unit cell to a monoclinic (P1) unit cell accompanied by jumps in the resistivity and magnetic susceptibility [16][17][18][19][20][21][22][23]. In this first low-temperature charge-ordered phase, one-dimensional stripes of Ir dimers with a strongly reduced bond length have been observed by x-ray diffraction and are described by a wave vector (5 × 1 × 5) [11,16,20,[24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Examining the surface phase diagram of IrTe2 with photoemission

et al. 2020

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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. Bulksensitive measurements have shown that, upon cooling, IrTe 2 undergoes two such first-order transitions to (5 × 1 × 5) and (8 × 1 × 8) reconstructed phases at T c 1 ∼ 280 K and T c 2 ∼ 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 × 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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Section: Introductionmentioning

confidence: 99%

Examining the surface phase diagram of IrTe2 with photoemission

et al. 2020

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“…IrTe 2 undergoes several structural first-order phase transitions below RT. The system goes from a trigonal unit cell of CdI 2 -type (P 3m1) to a monoclinic unit cell (P 1) accompanied by a sudden jump in resistivity and magnetic susceptibility at T c 1 = 278 K [6,7,8,9,10,11,12,13,14]. In this first charge ordered phase, one-dimensional stripes of Ir dimers [15,16] appear due to a large decrease of their bond length and lead to a bulk (5 × 1 × 5) superstructure [16,17,6,18,10,19,20], see Figure 1 (c-d).…”

Section: Introductionmentioning

confidence: 99%

Break of symmetry at the surface of IrTe$_2$ upon phase transition measured by X-ray photoelectron diffraction

Rumo,

Pulkkinen,

et al. 2021

Preprint

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IrTe 2 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 −IrTe 2 in the first-order phase transition, from the (1 × 1) phase to the (5 × 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 IrTe 2 trigonal to a monoclonic unit cell and confirm the occurence of the (5 × 1) reconstruction within the first few layers below the surface with a staircase-like stacking of dimers.

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“…IrTe 2 undergoes several structural first-order phase transitions below room temperature (RT). The system goes from a trigonal unit cell of CdI 2 -type (P 3m1) to a monoclinic unit cell (P 1) accompanied by a sudden jump in resistivity and magnetic susceptibility at T c1 = 278 K [26,[28][29][30][31][32][33][34][35]. In this first charge-ordered phase, one-dimensional stripes of Ir dimers [25,36] appear due to a large decrease of their bond length and lead to a (5 × 1 × 5) superstructure [23,28,32,[36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Insensitivity of the striped charge orders in IrTe2 to alkali surface doping implies their structural origin

Rumo

Pulkkinen

Salzmann

et al. 2021

Phys. Rev. Materials

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We present a combined angle-resolved photoemission spectroscopy and low-energy electron diffraction (LEED) study of the prominent transition metal dichalcogenide IrTe2 upon potassium (K) deposition on its surface. Pristine 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. Supported by density functional theory calculations, we first show that the K atoms dope the topmost IrTe2 layer with electrons, therefore strongly decreasing the work function and shifting only the electronic surface states towards higher binding energy. We then follow the evolution of its electronic structure as a function of temperature across the charge-ordered phase transitions and observe that their critical temperatures are unchanged for K coverages of 0.13 and 0.21 monolayer. Using LEED we also confirm that the periodicity of the related stripe phases is unaffected by the K doping. We surmise that the chargeordered phase transitions of IrTe2 are robust against electron surface doping, because of its metallic nature at all temperatures, and due to the importance of structural effects in stabilizing charge order in IrTe2.

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Phase transition in IrTe2 induced by spin-orbit coupling

Cited by 6 publications

References 42 publications

Examining the surface phase diagram of IrTe2 with photoemission

Examining the surface phase diagram of IrTe2 with photoemission

Break of symmetry at the surface of IrTe$_2$ upon phase transition measured by X-ray photoelectron diffraction

Insensitivity of the striped charge orders in IrTe2 to alkali surface doping implies their structural origin

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