论文标题
$ d_ {xz/yz} $和$ d_ {xy} $ orbitals in Sr $ _2 $ ruo $ _4 $之间的轨间P-和D波配对
Inter-orbital p- and d-wave pairings between $d_{xz/yz}$ and $d_{xy}$ orbitals in Sr$_2$RuO$_4$
论文作者
论文摘要
我们通过组理论方法研究SR $ _2 $ ruo $ _4 $的配对对称性。我们强调了Quasi One-digonional（q1d）$ d_ {xz/yz} $与quasi-two-two-dimensional（q2d）$ d_ {xy} $ orbitals之间的配对相互作用的作用。发现两个退化的轨间时间反转不变（TRI）P-波配对，一个是旋转的单词，另一个带有平面外$ \ bm {d} $的自旋旋转 - 可能是最有前途的候选人。提出了几个重要的物理量，包括近节点间隙结构，未改变的平面骑士移位以及在应变下没有分裂过渡，这与实验一致。此外，这些P波配对揭示了解决时间反转断裂与平面内骑士移动测量值之间的矛盾。随着系统在应用应变下达到van霍夫的奇异性时，配对对称性将成为D-Wave配对，主要由轨间组成组成，这可能导致紧张的3 $ K $相。
We study the pairing symmetry of Sr$_2$RuO$_4$ through the group-theoretical approach. We emphasize the role of pairing interaction between the quasi-one-dimensional(Q1D) $d_{xz/yz}$ and quasi-two-dimensional(Q2D) $d_{xy}$ orbitals. It is found that two degenerate inter-orbital time-reversal-invariant(TRI) p-wave pairings, one is spin-singlet and the other spin-triplet with out-of-plane $\bm{d}$-vector, could be the most promising candidates. Several important physical quantities are presented, including the near-nodal gap structure, the unchanged out-of-plane Knight shift, and no split transition under strain, which are consistent with the experiments. In addition, these p-wave pairings shed light on resolving the contradiction between the time-reversal breaking and reduced in-plane Knight shift measurements. As the system reaches the Van Hove singularity under applied strain, the pairing symmetry would become a d-wave pairing mainly consisting of inter-orbital components, which could be responsible for the strained 3$K$ phase.
