Anomalous magnetic moments as evidence of chiral superconductivity in a Bi/Ni bilayer
Anomalous magnetic moments as evidence of chiral superconductivity in a Bi/Ni bilayer
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反常磁矩作为 Bi/Ni 双层手性超导性的证据
DOI：
10.1103/physrevb.96.054519
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发表时间：
2017
影响因子：
3.7
通讯作者：
Lu Li
中科院分区：
文献类型：
--
作者：
Wang Junhua;Gong Xinxin;Yang Guang;Lyu Zhaozheng;Pang Yuan;Liu Guangtong;Ji Zhongqing;Fan Jie;Jing Xiunian;Yang Changli;Qu Fanming;Jin Xiaofeng;Lu Li
在过去的五十年里，人们不断努力寻找非常规超导性。与铜酸盐中已被公认的波超导性相比，具有其他高角动量对对称性的超导性的存在还不太确定。Bi/Ni外延双层膜是一种潜在的时间反转对称性破缺的非常规超导体，因为它在低温下同时表现出超导电性和铁磁性。我们采用一个专门设计的超导量子干涉仪（SQUID）检测，在Bi/Ni双层，轨道磁矩，这是预期的，如果TRS被打破。在超导态下确实观察到了反常的磁滞磁响应，为材料中存在手征超导畴提供了证据。
There have been continuous efforts in searching for unconventional superconductivity in the past five decades. Compared to the well-established-wave superconductivity in cuprates, the existence of superconductivity with pairing symmetries of other high angular momentum is less conclusive. Bi/Ni epitaxial bilayer is a potential unconventional superconductor with broken time reversal symmetry (TRS), for that it demonstrates superconductivity and ferromagnetism simultaneously at low temperatures. We employ a specially designed superconducting quantum interference device (SQUID) to detect, on the Bi/Ni bilayer, the orbital magnetic moments which are expected if the TRS is broken. An anomalous hysteretic magnetic response is indeed observed in the superconducting state, providing the evidence for the existence of chiral superconducting domains in the material.