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25 April 2024

» arxiv » 1512.5203

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Atomically Resolved FeSe/SrTiO3(001) Interface Structure by Scanning Transmission Electron Microscopy
Fangsen Li ; Qinghua Zhang ; Chenjia Tang ; Chong Liu ; Jinan Shi ; CaiNa Nie ; Guanyu Zhou ; Zheng Li ; Wenhao Zhang ; Can-Li Song ; Ke He ; Shuaihua Ji ; Shengbai Zhang ; Lin Gu ; Lili Wang ; Xu-Cun Ma ; Qi-Kun Xue ;
Date:	16 Dec 2015
Abstract:	Interface-enhanced high-temperature superconductivity in one unit-cell (UC) FeSe films on SrTiO3(001) (STO) substrate has recently attracted much attention in condensed matter physics and material science. By combined in-situ scanning tunneling microscopy/spectroscopy (STM/STS) and ex-situ scanning transmission electron microscopy (STEM) studies, we report on atomically resolved structure including both lattice constants and actual atomic positions of the FeSe/STO interface under both non-superconducting and superconducting states. We observed TiO2 double layers (DLs) and significant atomic displacements in the top two layers of STO, lattice compression of the Se-Fe-Se triple layer, and relative shift between bottom Se and topmost Ti atoms. By imaging the interface structures under various superconducting states, we unveil a close correlation between interface structure and superconductivity. Our atomic-scale identification of FeSe/STO interface structure provides useful information on investigating the pairing mechanism of this interface-enhanced high-temperature superconducting system.
Source:	arXiv, 1512.5203
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