Odd-parity superconductivity driven by octahedra rotations in iridium oxides

Austin W. Lindquist; Hae-Young Kee

doi:10.1103/PhysRevB.100.054512

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Odd-parity superconductivity driven by octahedra rotations in iridium oxides

Austin W. Lindquist, Hae-Young Kee

DOI 10.1103/PhysRevB.100.054512 · Physical Review B

T1

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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 Sr2IrO4, 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Sr2IrO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown