时间反演对称性破缺的笼目超导输运现象  

Transport phenomena in time-reversal symmetry-breaking Kagome superconductors

作　　者：杨硕颖 殷嘉鑫 Yang Shuo-Ying;Yin Jia-Xin(Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China)

机构地区：[1]南方科技大学物理系,深圳518055

出　　处：《物理学报》2024年第15期1-4,共4页Acta Physica Sinica

摘　　要：近期对钒基笼目超导体(AV_(3)Sb_(5),A=K,Cs,Rb)家族中三种材料的低温量子输运测量均显示出时间反演对称性破缺的超导态.其中,在Nb/K_(1–x)V_(3)Sb/Nb的约瑟夫森结和RbV_(3)Sb_(5)中,超导转变温度以下的磁阻随磁场扫动方向存在磁滞现象;C_(s)V_(3)Sb_(5)中存在零磁场下的超导二极管现象,即正向和反向的超导临界电流大小不同.首先,本文讨论了这些实验现象的区别和联系.然后,讨论产生上述非常规超导输运现象的可能机理,如手性超导序参量(d+id或p+ip),以及由电荷密度波与常规超导态耦合产生的手性配对密度波.Recent studies have found that all three materials within the vanadium-based Kagome superconductors(AV_(3)Sb_(5),A=K,Cs,Rb)exhibit time-reversal symmetry-breaking behaviors in the superconducting states.Among the three,the Josephson junctions structuredNb/K_(1-x)V_(3)Sb/Nb and RbV_(3)Sb_(5) show magnetic hysteresis below the superconducting transition temperature.In C_(s)V_(3)Sb_(5),there exists a zero-field superconducting diode effect,meaning the magnitude of the positive and negative superconducting critical current are different.We first discuss the similarities and differences among the three above-mentioned experiments.Then,we discuss the possible mechanisms responsible for the unconventional superconducting transport phenomena:such as chiral superconducting order parameter(d+id or p+ip),and chiral pair density waves arising from the coupling of the charge density waves and conventional superconducting states.

关 键 词：笼目超导体 对称性破缺 超导二极管 

分 类 号：O469[理学—凝聚态物理]