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28 March 2024
 
  » arxiv » 1908.3427

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The study of intrinsic defect state of FeSe with scanning tunneling microscopy
Kunliang Bu ; Bo Wang ; Wenhao Zhang ; Ying Fei ; Yuan Zheng ; Fangzhou Ai ; Zongxiu Wu ; Qisi Wang ; Hongliang Wo ; Jun Zhao ; Chuanhong Jin ; Yi Yin ;
Date 9 Aug 2019
AbstractWe apply high resolution scanning tunneling microscopy to study intrinsic defect states of bulk FeSe. Four types of intrinsic defects including the type I dumbbell, type II dumbbell, top-layer Se vacancy and inner-layer Se-site defect are extensively analyzed by scanning tunneling spectroscopy. From characterized depression and enhancement of density of states measured in a large energy range, the type I dumbbell and type II dumbbell are determined to be the Fe vacancy and Se$_mathrm{Fe}$ defect, respectively. The top-layer Se vacancy and possible inner-layer Se-site vacancy are also determined by spectroscopy analysis. The determination of defects are compared and largely confirmed in the annular dark-field scanning transmission electron microscopy measurement of the exfoliated FeSe. The detailed mapping of defect states in our experiment lays the foundation for a comparison with complex theoretical calculations in the future.
Source arXiv, 1908.3427
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