Strain-induced superconductivity in Sr2IrO4

Lena Engström; Chia-Chuan Liu; William Witczak-Krempa; T. Pereg-Barnea

doi:10.1103/PhysRevB.108.014508

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Strain-induced superconductivity in Sr2IrO4

Lena Engström, Chia-Chuan Liu, William Witczak-Krempa, T. Pereg-Barnea

DOI 10.1103/PhysRevB.108.014508 · Physical Review B

T1

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Abstract

Multiorbital quantum materials with strong interactions can host a variety of novel phases. In this work we study the possibility of interaction-driven superconductivity in the iridate compound Sr2IrO4 under strain and doping. We find numerous regimes of strain-induced superconductivity in which the pairing structure depends on model parameters. Spin-fluctuation mediated superconductivity is modeled by a Hubbard-Kanamori model with an effective particle-particle interaction, calculated via the random phase approximation. Magnetic orders are found using the Stoner criterion. The most likely superconducting order we find has d-wave pairing, predominantly in the total angular momentum J=12 states. Moreover, an s± order which mixes different bands is found at high Hund's coupling, and at high strain anisotropic s- and d-wave orders emerge. Finally, we show that in a fine-tuned region of parameters a spin-triplet p-wave order exists. The combination of strong spin-orbit coupling, interactions, and a sensitivity of the band structure to strain proves a fruitful avenue for engineering new quantum phases.

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