Odd-Parity Superconductivity Driven by Octahedra Rotations in Iridium Oxides

Abstract

Iridium oxides have provided a playground to study novel phases originating from spin-orbit coupling and electron-electron interactions. Among them, the d-wave singlet superconductor was proposed for electron-doped Sr${}_2$IrO${}_4$, containing two Ir atoms in a unit cell due to the staggered rotation of oxygen octahedra about the c-axis. It was also noted that such oxygen octahedra rotation affects electronic transports. Here we study the role of octahedra tilting away from the c-axis, in determining superconducting pairing symmetry. We show that the octahedra tilting changes the large Fermi surface to a Dirac point, which strongly suppresses the conventional d-wave pairing. Furthermore, it also promotes effective spin-triplet interactions in the strong Hubbard interaction limit, leading to a transition from the even-parity to odd-parity superconducting phase. Thus, tuning octahedra distortions can be used as a tool to engineer a spin triplet superconductor in strongly correlated systems with strong spin-orbit coupling.

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• Identifying Topological Superconductivity in 2D Transition-Metal Dichalcogenides
• Quest for New Quantum States via Field-Editing Technology
• Strain-induced superconductivity in Sr2IrO4
• Evolution of electronic and magnetic properties of Sr${}_2$IrO${}_4$ under strain
• Spin and charge order in doped spin-orbit coupled Mott insulators
• Structural origin of the Jeff=1/2 antiferromagnetic phase in Ga-doped Sr2IrO4