Superconductivity in doped Sr2IrO4: A functional renormalization group study

Yang Yang; Wan-Sheng Wang; Jin-Guo Liu; Hua Chen; Jian-Hui Dai; Qiang-Hua Wang

doi:10.1103/PhysRevB.89.094518

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Superconductivity in doped Sr2IrO4: A functional renormalization group study

Yang Yang, Wan-Sheng Wang, Jin-Guo Liu, Hua Chen, Jian-Hui Dai, Qiang-Hua Wang

DOI 10.1103/PhysRevB.89.094518 · Physical Review B

T1

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Abstract

Using the functional renormalization group we investigated possible superconductivity in doped Sr2IrO4. In the electron-doped case, a dx2−y2*-wave superconducting phase is found in a narrow doping region. The pairing is driven by spin fluctuations within the single conduction band. In contrast, for hole doping an s±*-wave phase is established, triggered by spin fluctuations within and across the two conduction bands. In all cases there are comparable singlet and triplet components in the pairing function. The Hund's rule coupling reduces (enhances) superconductivity for electron (hole) doping. Our results imply that hole doping is more promising to achieve a higher transition temperature. Experimental perspectives are discussed.

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