Higher angular momentum pairings in interorbital shadowed-triplet superconductors: Application to Sr2RuO4
Jonathan Clepkens, Austin W. Lindquist, Xiaoyu Liu, Hae-Young Kee
DOI 10.1103/PhysRevB.104.104512 · Physical Review B
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Abstract
Even-parity interorbital spin-triplet pairing emerges as an intriguing candidate in multiorbital superconductors with significant Hund's and spin-orbit coupling. Within such a state, the pairing is dominated by the intraband pseudospin-singlet component via the spin-orbit coupling, distinguishing it from a pure spin triplet and motivating the name, shadowed triplet. With atomic spin-orbit coupling, it was shown that this pairing exhibits an anisotropic s-wave character, while higher angular momentum pairing symmetries such as d- or g-wave have been proposed based on phenomenological analyses in candidate systems. A natural question is then whether higher angular momentum pairings may arise with this form of spin-triplet pairing. Here, we examine the interplay between spin-orbit coupling and the electronic dispersions in correlated metals and demonstrate how they can be realized. We apply this idea to Sr2RuO4 and determine the competition among different pairing states as multiple spin-orbit coupling parameters are tuned. The presence of both d- and g-wave pairings, including a d+ig state, are found when momentum-dependent spin-orbit coupling with d-wave character is increased. Implications of the theory and future directions are also discussed.
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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