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Orbital driven two-dome superconducting phases in multiorbital superconductors
Physics Letters A ( IF 2.3 ) Pub Date : 2020-12-29 , DOI: 10.1016/j.physleta.2020.127118
Jing Liu , Qing-Wei Wang , Liang-Jian Zou

We theoretically study the superconductivity in multiorbital superconductors based on a three-orbital tight-banding model. With appropriate values of the nearest-neighbor exchange J1αβ and the next-nearest-neighbor exchange J2αβ, we find a two-dome structure in the Tcn phase diagram: one dome in the doping range n<3.9 where the superconducting (SC) state is mainly sx2y2 component contributed by inter-orbital pairing, the other dome in the doping range 3.9<n<4.46 where the SC state is mainly sx2y2+sx2+y2 components contributed by intra-orbital pairing. We find that the competition between different orbital pairing leads to two-dome SC phase diagrams in multiorbital superconductors, and different matrix elements of J1 and J2 considerably affect the boundary of two SC domes.



中文翻译:

多轨道超导体中的轨道驱动两圆顶超导相

我们从理论上研究了基于三轨道紧密带模型的多轨道超导体的超导性。具有最近邻居交换的适当值Ĵ1个αβ 和下一个最近邻居交换 Ĵ2αβ,我们在 ŤC-ñ 相图:掺杂范围内的一个圆顶 ñ<3.9 超导(SC)状态主要是 sX2ÿ2 组分由轨道间配对贡献,掺杂范围内的另一个圆顶 3.9<ñ<4.46 SC状态主要是 sX2ÿ2+sX2+ÿ2成分由轨道内配对贡献。我们发现,不同轨道配对之间的竞争导致了多轨道超导体中的两球SC相图,以及不同的矩阵元素。Ĵ1个Ĵ2 大大影响了两个SC圆顶的边界。

更新日期:2020-12-29
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