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arXiv 2210.00554cond-mat.supr-concond-mat.str-el
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用Sr $_2$ RuO $_4$的偶宇称超导性消除约瑟夫森结实验中的$π$相移

Reconciling $π$ phase shift in Josephson junction experiments with even-parity superconductivity in Sr$_2$RuO$_4$

Austin W. Lindquist, Hae-Young Kee

摘要:

Sr $_2$ RuO $_4$的超导态曾被认为是$p$波超导性的主要候选者。低于转变温度的恒定Knight位移为自旋三重态配对提供了证据,而在约瑟夫森结隧穿实验中观察到的$π$相移表明了奇宇称配对,这两种情况都由$p$波态描述。然而,随着最近的实验观察到在转变温度以下奈特位移的显着减少,表明自旋单重态,奇宇称结果有待协调。在这项工作中,我们表明,一个偶宇称赝自旋单重态起源于轨道间配对通过自旋轨道耦合可以解释什么被认为是一个奇宇称态的证据。在存在小镜像对称性破缺的情况下,轨道间配对是唯一能够显示解释这些实验结果所需的奇宇称特性的。此外,我们讨论了如何这些实验可用于区分拟议的配对状态的Sr $_2$ RuO $_4$。

英文摘要:

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$_4$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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