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Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO3
Science Advances ( IF 13.6 ) Pub Date : 2020-04-08 , DOI: 10.1126/sciadv.aay4517
Rui Peng 1, 2, 3 , Ke Zou 1, 2 , M. G. Han 4 , Stephen D. Albright 2, 5 , Hawoong Hong 6 , Claudia Lau 2, 5 , H. C. Xu 1, 2, 3 , Yimei Zhu 4 , F. J. Walker 1, 2 , C. H. Ahn 1, 2, 5, 7
Affiliation  

Remarkable enhancement of the superconducting transition temperature (Tc) has been observed for monolayer (ML) FeSe films grown on SrTiO3 substrates. The atomic-scale structure of the FeSe/SrTiO3 interface is an important determinant of both the magnetic and interfacial electron-phonon interactions and is a key ingredient to understanding its high-Tc superconductivity. We resolve the atomic-scale structure of the FeSe/SrTiO3 interface through a complementary analysis of scanning transmission electron microscopy and in situ surface x-ray diffraction. We find that the interface is more strongly bonded for a particular registration, which leads to a coherently strained ML. We also determine structural parameters, such as the distance between ML FeSe and the oxide, Se─Fe─Se bond angles, layer-resolved distances between Fe─Se, and registry of the FeSe lattice relative to the oxide. This picoscale structure determination provides an explicit structural framework and constraint for theoretical approaches addressing the high-Tc mechanism in FeSe/SrTiO3.



中文翻译:

对单层FeSe / SrTiO3超导性的皮尺度结构洞察

对于在SrTiO 3衬底上生长的单层(ML)FeSe薄膜,已经观察到超导转变温度(T c)的显着提高。FeSe / SrTiO 3界面的原子级结构是磁性和界面电子-声子相互作用的重要决定因素,并且是理解其高T c超导性的关键因素。我们解析了FeSe / SrTiO 3的原子尺度结构通过扫描透射电子显微镜和原位表面X射线衍射的互补分析确定界面。我们发现,对于特定的配准,界面更牢固地结合在一起,从而导致相干拉伸的ML。我们还确定了结构参数,例如ML FeSe与氧化物之间的距离,Se-Fe-Se键角,Fe-Se之间的层分辨距离以及FeSe晶格相对于氧化物的配准。皮秒级结构确定为解决FeSe / SrTiO 3中T c机理的理论方法提供了明确的结构框架和约束。

更新日期:2020-04-08
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