论文标题
约瑟夫森连接实验中的$π$相位均匀的超级传导性在sr $ _2 $ ruo $ _4 $中
Reconciling $π$ phase shift in Josephson junction experiments with even-parity superconductivity in Sr$_2$RuO$_4$
论文作者
论文摘要
SR $ _2 $ ruo $ _4 $的超导状态曾经被认为是$ p $ - 波超导的领先候选人。低于过渡温度的恒定骑士移位提供了自旋三杆配对的证据，在约瑟夫森交界处隧道实验中观察到的$π$相位移动表明奇数配对，这两种均由$ p $ - 波 - 波态描述。然而，随着最近的实验观察到骑士移位在过渡温度以下的显着降低，表示旋转单调状态，因此奇数结果必须核对。在这项工作中，我们表明，通过旋转轨道耦合源自孔内配对的偶数伪singlet状态可以解释被认为是奇数状态的证据。在存在小镜子对称性破裂的情况下，轨道间配对具有独特的能力，能够显示出解释这些实验结果所需的奇数特征。此外，我们讨论如何使用这些实验来区分SR $ _2 $ ruo $ _4 $的提议的配对状态。
The superconducting state of Sr$_2$RuO$_4$ was once thought to be a leading candidate for $p$-wave superconductivity. A constant Knight shift below the transition temperature provided evidence for spin-triplet pairing, and a $π$ phase shift observed in Josephson junction tunneling experiments suggested odd-parity pairing, both of which are described by $p$-wave states. However, with recent experiments observing a significant decrease in the Knight shift below the transition temperature, signifying a spin-singlet state, the odd-parity results are left to be reconciled. In this work, we show that an even-parity pseudospin-singlet state originating from interorbital pairing via spin-orbit coupling can explain what has been assumed to be evidence for an odd-parity state. In the presence of small mirror symmetry breaking, interorbital pairing is uniquely capable of displaying odd-parity characteristics required to explain these experimental results. Further, we discuss how these experiments may be used to differentiate the proposed pairing states of Sr$_2$RuO$_4$.
