论文标题
超导NIBI3单晶的自发时间反转对称性和铁磁
Absence of spontaneous time-reversal symmetry breaking and ferromagnetism in superconducting NiBi3 single crystal
论文作者
论文摘要
最近的实验表明，手性p波状的超导性超导性在外延BI/NI双层中是自发的时间反转对称性破坏（TRSB），使其成为探索物理学的有前途平台，可用于拓扑受保护的量子计算。相当有趣的是，有证据表明，在非外皮Bi/ni双层中，由于NIBI3的形成而产生了超导性，据报道，这是在表面上宿主共存的铁电磁和超导命令。我们使用单晶NIBI3上的SAGNAC干涉仪进行高分辨率的表面磁磁量KERR效应（烟雾）测量，并且没有任何自发Kerr信号的迹象，除了被困涡流的贡献。这强烈表明NIBI3中的TRSB不存在，无论是由于超导状态中的TRSB还是任何共存的铁磁性，我们得出的结论是，在非司法BI/NI中发现的超导性与外生BI/NI中的超导性与此不同。
Recent experiments have pointed to a chiral p-wave-like superconductivity in epitaxial Bi/Ni bilayers that are spontaneously time-reversal symmetry breaking (TRSB), making it a promising platform for exploring physics useful for topologically protected quantum computing. Quite intriguingly, evidence has emerged that in non-epitaxial Bi/Ni bilayers, superconductivity arises due to the formation of NiBi3, which has been reported to host coexisting ferromagnetic and superconducting orders at the surface. We perform high resolution surface magneto-optic Kerr effect (SMOKE) measurements using a Sagnac interferometer on single crystal NiBi3 and find no sign of any spontaneous Kerr signal except for contributions from trapped vortices. This strongly indicates the absence of TRSB in NiBi3, whether due to TRSB in the superconducting state or any coexisting ferromagnetism, and we conclude that the superconductivity found in non-epitaxial Bi/Ni is distinctively different from that in epitaxial Bi/Ni.
