论文标题
在$γ_3$系统中与四极订单共存的列和反转超导能力
Nematic and time-reversal breaking superconductivities coexisting with quadrupole order in a $Γ_3$ system
论文作者
论文摘要
我们讨论了$γ_3$非kramers系统的立方晶格的模型中的超导率。在先前的研究中，据揭示了$ d $ - 波$ e_g $对称性的超导率在$γ_3$系统的广泛参数范围内发生。这种各向异性超导性可以打破晶格的立方对称性。在$γ_3$系统中，四极杆的自由度是活跃的，并且立方对称性破裂的效果应该很重要。在这里，我们通过平均场理论调查了$ d $ - 波超导的共存状态。特别是，我们讨论了超导性和四杆秩序之间可能的竞争与合作，具体取决于它们的类型。我们发现列神经超导率打破了立方对称性并与四极顺序共存。在当前模型中，我们还发现$ D+ID $超导性，它打破了时间反转对称性，但保留了立方对称性。我们还讨论了单轴压力对这些超导状态的影响。
We discuss superconductivity in a model on a cubic lattice for a $Γ_3$ non-Kramers system. In previous studies, it is revealed that $d$-wave superconductivity with $E_g$ symmetry occurs in a wide parameter range in a $Γ_3$ system. Such anisotropic superconductivity can break the cubic symmetry of the lattice. In a $Γ_3$ system, the quadrupole degrees of freedom are active and the effect of the cubic symmetry breaking should be important. Here, we investigate the coexisting states of the $d$-wave superconductivity and quadrupole order by a mean-field theory. In particular, we discuss possible competition and cooperation between the superconductivity and quadrupole order depending on types of them. We find nematic superconductivity breaking the cubic symmetry and coexisting with quadrupole order. In the present model, we also find $d+id$ superconductivity, which breaks time-reversal symmetry but retains the cubic symmetry. We also discuss the effects of uniaxial stress on these superconducting states.
