Multipole-fluctuation pairing mechanism of dx2−y2 + ig superconductivity in Sr2RuO4
Yutao Sheng, Yu Li, Yi-feng Yang
DOI 10.1103/PhysRevB.106.054516 · Physical Review B
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Abstract
Despite many experimental and theoretical efforts, the pairing symmetry of superconductivity in Sr2RuO4 remains undecided. The accidentally degenerate dx2−y2+ig is consistent with most current experiments and seems to be one of the most probable candidates, but we still lack a satisfactory theoretical mechanism for its appearance. Here we construct a phenomenological model combining realistic electronic band structures and all symmetry-allowed multipole fluctuations as potential pairing glues and make a systematic survey of major pairing states within the Eliashberg framework. Our calculations show that dx2−y2+ig can arise naturally from the interplay of antiferromagnetic, ferromagnetic, and electric multipole fluctuations whose coexistence is manifested in previous experiments and calculations. Our work provides a physically reasonable basis supporting the possibility of dx2−y2+ig pairing in superconducting Sr2RuO4.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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