Evidence of P-wave Pairing in K$_2$Cr$_3$As$_3$ Superconductors from Phase-sensitive Measurement

• URL: http://arxiv.org/abs/2408.07342v2
• Date: Wed, 05 Feb 2025 16:29:54 GMT
• Title: Evidence of P-wave Pairing in K$_2$Cr$_3$As$_3$ Superconductors from Phase-sensitive Measurement
• Authors: Zhiyuan Zhang, Ziwei Dou, Anqi Wang, Cuiwei Zhang, Yu Hong, Xincheng Lei, Yue Pan, Zhongchen Xu, Zhipeng Xu, Yupeng Li, Guoan Li, Xiaofan Shi, Xingchen Guo, Xiao Deng, Zhaozheng Lyu, Peiling Li, Faming Qu, Guangtong Liu, Dong Su, Kun Jiang, Youguo Shi, Li Lu, Jie Shen, Jiangping Hu,
• Abstract summary: We study a recently discovered family of superconductors, A$$Cr$_3$As$_3$ (A = K, Rb, Cs) We fabricate superconducting quantum interference devices (SQUIDs) on exfoliated K$$Cr$_3$As$_3$, and perform the phase-sensitive measurement. We observe that such SQUIDs exhibit a pronounced second-order harmonic component sin (2$pi$) in the current-phase relation, suggesting the admixture of 0- and $pi$-phase.
• Score: 26.69408771617283
• License:
• Abstract: P-wave superconductors hold immense promise for both fundamental physics and practical applications due to their unusual pairing symmetry and potential topological superconductivity. However, the exploration of the p-wave superconductors has proved to be a complex endeavor. Not only are they rare in nature but also the identification of p-wave superconductors has been an arduous task in history. For example, phase-sensitive measurement, an experimental technique which can provide conclusive evidence for unconventional pairing, has not been implemented successfully to identify p-wave superconductors. Here, we study a recently discovered family of superconductors, A$_2$Cr$_3$As$_3$ (A = K, Rb, Cs), which were proposed theoretically to be a candidate of p-wave superconductors. We fabricate superconducting quantum interference devices (SQUIDs) on exfoliated K$_2$Cr$_3$As$_3$, and perform the phase-sensitive measurement. We observe that such SQUIDs exhibit a pronounced second-order harmonic component sin(2$\pi$) in the current-phase relation, suggesting the admixture of 0- and $\pi$-phase. By carefully examining the magnetic field dependence of the oscillation patterns of critical current and Shapiro steps under microwave irradiation, we reveal a crossover from 0- to $\pi$-dominating phase state and conclude that the existence of the $\pi$-phase is in favor of the p-wave pairing symmetry in K$_2$Cr$_3$As$_3$.

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