Structural phase transition induced by van Hove singularity in 5d transition metal compound IrTe2

Abstract

Comprehensive studies of the electronic states of Ir 5d and Te 5p have been performed to elucidate the origin of the structural phase transition in IrTe2 by combining angle-resolved photoemission spectroscopy and resonant inelastic X-ray scattering. While no considerable changes are observed in the configuration of the Ir 5d electronic states across the transition, indicating that the Ir 5d orbitals are not involved in the transition, we reveal a van Hove singularity at the Fermi level (EF) related to the Te px+py orbitals, which is removed from EF at low temperatures. The wavevector connecting the adjacent saddle points is consistent with the in-plane projection of the superstructure modulation wavevector. These results can be qualitatively understood with the Rice-Scott "saddle-point" mechanism, while effects of the lattice distortions need to be additionally involved.

5 pages, 4 fitures

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• Evidence for spin-triplet odd-parity superconductivity close to type-II van Hove singularities
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• Tuning Superconductivity and Charge Density Wave Order in 2H-TaSe2 by Modulating the Van Hove Singularity
• Structural phase transition and electronic structure evolution in Ir1-xPtxTe2 studied by scanning tunneling microscopy
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• Unveiling the orbital-selective electronic band reconstruction through the structural phase transition in TaTe${}_2$
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