Observation of an electronic order along [110] direction in FeSe

Kunliang Bu, Wenhao Zhang, Ying Fei, Yuan Zheng, Fangzhou Ai, Zongxiu Wu, Qisi Wang, Hongliang Wo, Jun Zhao and Yi Yin ()
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Kunliang Bu: Zhejiang University
Wenhao Zhang: Zhejiang University
Ying Fei: Zhejiang University
Yuan Zheng: Zhejiang University
Fangzhou Ai: Zhejiang University
Zongxiu Wu: Zhejiang University
Qisi Wang: Fudan University
Hongliang Wo: Fudan University
Jun Zhao: Fudan University
Yi Yin: Zhejiang University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract 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.

Date: 2021
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DOI: 10.1038/s41467-021-21318-w

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