Important Roles of Te 5p and Ir 5d Spin-orbit Interactions on the Multi-band Electronic Structure of Triangular Lattice Superconductor Ir1-xPtxTe2

Abstract

We report an angle-resolved photoemission spectroscopy (ARPES) study on a triangular lattice superconductor Ir${}_{1-x}$Pt${}_x$Te${}_2$ in which the Ir-Ir or Te-Te bond formation, the band Jahn-Teller effect, and the spin-orbit interaction are cooperating and competing with one another. The Fermi surfaces of the substituted system are qualitatively similar to the band structure calculations for the undistorted IrTe${}_2$ with an upward chemical potential shift due to electron doping. A combination of the ARPES and the band structure calculations indicates that the Te $5p$ spin-orbit interaction removes the $p_x/p_y$ orbital degeneracy and induces $p_x\pm i{p}_y$ type spin-orbit coupling near the A point. The inner and outer Fermi surfaces are entangled by the Te $5p$ and Ir $5d$ spin-orbit interactions which may provide exotic superconductivity with singlet-triplet mixing.

10 pages, 4 figures

References in corpus (7)

• Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
• Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4
• Quantum spin Hall effect in a transition metal oxide Na2IrO3
• Superconductivity Induced by Bond Breaking in the Triangular Lattice of IrTe2
• Anionic depolymerization transition in IrTe2
• Competition between the structural phase transition and superconductivity in Ir${}_{1-x}$Pt${}_x$Te${}_2$ as revealed by pressure effects
• Evidence for a cos(4φ) Modulation of the Superconducting Energy Gap of Optimally Doped FeTe_{0.6}Se_{0.4} Single Crystals Using Laser Angle-Resolved Photoemission Spectroscopy

Cited by in corpus (9)

• Structural phase transition induced by van Hove singularity in 5d transition metal compound IrTe2
• Examining the surface phase diagram of IrTe${}_2$ with photoemission
• Thermoelectric studies of Ir${}_{1-x}$Rh${}_x$Te${}_2$ (0 $⩽x⩽$ 0.3)
• Structural phase transition and electronic structure evolution in Ir1-xPtxTe2 studied by scanning tunneling microscopy
• Te 5p orbitals bring three-dimensional electronic structure to two-dimensional Ir0.95Pt0.05Te2
• No superconductivity in Pb${}_9$Cu${}_1$(PO${}_4$)${}_6$O found in orbital and spin fluctuation exchange calculations
• Fermi surface of IrTe2 in the valence-bond state as determined by quantum oscillations
• Insensitivity of the striped charge-orders in IrTe${}_2$ to alkali surface doping implies their structural origin
• Modulated, three-directional, and polar structural instability in layered $d^1$ NaTiO${}_2$