Nonreciprocal charge transport in topological kagome superconductor CsV3Sb5
Nonreciprocal charge transport in topological kagome superconductor CsV3Sb5
复制标题
DOI：
10.1038/s41535-022-00516-9
复制
发表时间：
2022-10
影响因子：
5.7
通讯作者：
Yueshen Wu;Qi Wang;Xiaoping Zhou;Jinghui Wang;P. Dong;Jiadian He;Yifan Ding;Bolun Teng
中科院分区：
文献类型：
--
作者：
Yueshen Wu;Qi Wang;Xiaoping Zhou;Jinghui Wang;P. Dong;Jiadian He;Yifan Ding;Bolun Teng
二维超导体中的非互易电荷输运现象得到了广泛的研究，由于对称性破缺，二维超导体表现出单向各向异性磁电阻。本文报道了CsV_3Sb_5超导薄片中的强非互易输运现象。二次谐波电压，主要来自整流效应的涡旋运动，明确地开发与面内和面外磁场，其幅度是可比的非中心对称超导体。二次谐波磁电阻分裂成几个峰，其中一些峰通过在超导转变内斜升磁场或电流来反转它们的符号。非互易性表明CsV3Sb5具有很强的不对称性。CsV3Sb5的中心对称结构和对称的电子相位很难引起明显的非互易输运现象，这可能与非常规超导序参量对称性的对称性破缺有关。
Nonreciprocal charge transport phenomena are widely studied in two-dimensional superconductors, which demonstrate unidirectional-anisotropy magnetoresistances as a result of symmetry breaking. Here, we report a strong nonreciprocal transport phenomenon in superconducting CsV3Sb5thin flakes. The second harmonic voltages, mainly originating from the rectification effect of vortex motion, are unambiguously developed with in-plane and out-of-plane magnetic fields, and their magnitudes are comparable to those in noncentrosymmetric superconductors. The second harmonic magnetoresistances split into several peaks and some of them reverse their signs by ramping the magnetic field or the current within the superconducting transition. The nonreciprocity suggests a strong asymmetry in CsV3Sb5. The centrosymmetric structure and symmetric electronic phases in CsV3Sb5can hardly induce the distinct nonreciprocal transport phenomenon, which could be correlated to a symmetry breaking from an unconventional superconducting order parameter symmetry.