Journal
PHYSICAL REVIEW B
Volume 89, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.094518
Keywords
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Funding
- NSFC [11023002, 11274084]
- Ministry of Science and Technology of China [2011CBA00108, 2011CB922101]
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Using the functional renormalization group we investigated possible superconductivity in doped Sr2IrO4. In the electron-doped case, a d(x2-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.
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