Using 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.
@article{arxiv.1312.4025,
title = {Functional renormalization group study of superconductivity in doped Sr$_2$IrO$_4$},
author = {Yang Yang and Wan-Sheng Wang and Jin-Guo Liu and Huo Chen and Jian-Hui Dai and Qiang-Hua Wang},
journal= {arXiv preprint arXiv:1312.4025},
year = {2014}
}