Bu Kunliang, Zhang Wenhao, Fei Ying, Zheng Yuan, Ai Fangzhou, Wu Zongxiu, Wang Qisi, Wo Hongliang, Zhao Jun, Yin Yi
Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou, China.
State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai, China.
Nat Commun. 2021 Mar 2;12(1):1385. doi: 10.1038/s41467-021-21318-w.
Multiple ordered states have been observed in unconventional superconductors. Here, we apply scanning tunneling microscopy to probe the intrinsic ordered states in FeSe, the structurally simplest iron-based superconductor. Besides the well-known nematic order along [100] direction, we observe a checkerboard charge order in the iron lattice, which we name a [110] electronic order in FeSe. The [110] electronic order is robust at 77 K, accompanied with the rather weak [100] nematic order. At 4.5 K, The [100] nematic order is enhanced, while the [110] electronic order forms domains with reduced correlation length. In addition, the collective [110] order is gaped around [-40, 40] meV at 4.5 K. The observation of this exotic electronic order may shed new light on the origin of the ordered states in FeSe.
在非常规超导体中已观察到多种有序态。在此，我们应用扫描隧道显微镜来探测结构最简单的铁基超导体FeSe中的本征有序态。除了沿[100]方向的众所周知的向列序外，我们在铁晶格中观察到一种棋盘状电荷序，我们将其命名为FeSe中的[110]电子序。[110]电子序在77 K时很稳定，同时伴随着相当弱的[100]向列序。在4.5 K时，[100]向列序增强，而[110]电子序形成关联长度减小的畴。此外，在4.5 K时，集体[110]序在[-40, 40]毫电子伏特附近出现能隙。这种奇异电子序的观测可能为FeSe中有序态的起源提供新的线索。
Zotero 插件
