Higher angular momentum pairings in interorbital shadowed-triplet superconductors: Application toSr2RuO4,Physical Review B

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Higher angular momentum pairings in interorbital shadowed-triplet superconductors: Application toSr2RuO4
Physical Review B ( IF 3.2 ) Pub Date : 2021-09-27 , DOI: 10.1103/physrevb.104.104512
Jonathan Clepkens ₁ , Austin W. Lindquist ₁ , Xiaoyu Liu ₁ , Hae-Young Kee _{1,

2}

Affiliation

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

{Sr}_{2} {RuO}_{4}

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 + i g

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.

中文翻译：

轨道间阴影三重态超导体中更高的角动量配对：Sr2RuO4 的应用

偶数轨道间自旋-三重态配对成为具有显着洪德和自旋-轨道耦合的多轨道超导体中的一个有趣候选。在这种状态下，配对由通过自旋轨道耦合的带内赝自旋单线分量主导，将其与纯自旋三重态区分开来，并激发了名称，阴影三重态。通过原子自旋轨道耦合，表明这种配对表现出各向异性