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25 April 2024 |
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Identification of a Large Amount of Excess Fe in Superconducting Single-Layer FeSe/SrTiO3 Films | | Yong Hu
; Yu Xu
; Qingyan Wang
; Lin Zhao
; Shaolong He
; Jianwei Huang
; Cong Li
; Guodong Liu
; X. J. Zhou
; | | Date: |
9 Apr 2019 | | Abstract: | The single-layer FeSe films grown on SrTiO3 (STO) substrates have attracted
much attention because of its record high superconducting critical temperature
(Tc). It is usually believed that the composition of the epitaxially grown
single-layer FeSe/STO films is stoichiometric, i.e., the ratio of Fe and Se is
1:1. Here we report the identification of a large amount of excess Fe in the
superconducting single-layer FeSe/STO films. By depositing Se onto the
superconducting single-layer FeSe/STO films, we find by in situ scanning
tunneling microscopy (STM) the formation of the second-layer FeSe islands on
the top of the first layer during the annealing process at a surprisingly low
temperature ($sim$150{deg}C) which is much lower than the usual growth
temperature ($sim$490{deg}C). This observation is used to detect excess Fe
and estimate its quantity in the single-layer FeSe/STO films. The amount of
excess Fe detected is at least 20% that is surprisingly high for the
superconducting single-layer FeSe/STO films. The discovery of such a large
amount of excess Fe should be taken into account in understanding the high-Tc
superconductivity and points to a likely route to further enhance Tc in the
superconducting single-layer FeSe/STO films. | | Source: | arXiv, 1904.4670 | | Services: | Forum | Review | PDF | Favorites | |
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