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23 April 2024 |
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Insulating Parent Phase and Distinct Doping Evolution to Superconductivity in Single-Layer FeSe/SrTiO3 Films | | Yong Hu
; Yu Xu
; Yi-Min Zhang
; Qing-Yan Wang
; Shao-Long He
; De-Fa Liu
; Ai-Ji Liang
; Jian-Wei Huang
; Cong Li
; Yong-Qing Cai
; Ding-Song Wu
; Guo-Dong Liu
; Fang-Sen
; Jia-Qi Fan
; Guan-Yu Zhou
; Lili Wang
; Can-Li Song
; Xu-Cun Ma
; Qi-Kun Xue
; Zu-Yan Xu
; Lin Zhao
; X. J. Zhou
; | | Date: |
9 Apr 2019 | | Abstract: | The single-layer FeSe/SrTiO3 (FeSe/STO) films have attracted much attention
because of their simple crystal structure, distinct electronic structure and
record high superconducting transition temperature (Tc). The origin of the
dramatic Tc enhancement in single-layer FeSe/STO films and the dichotomy of
superconductivity between single-layer and multiple-layer FeSe/STO films are
still under debate. Here we report a comprehensive high resolution
angle-resolved photoemission spectroscopy and scanning tunneling
microscopy/spectroscopy measurements on the electronic structure evolution with
doping in single-layer and multiple-layer FeSe/STO films. We find that the
single-layer FeSe/STO films have a distinct parent phase and a route of doping
evolution to superconductivity that are fundamentally different from
multiple-layer FeSe/STO films. The parent phase of the single-layer FeSe/STO
films is insulating, and its doping evolution is very similar to that of doping
a Mott insulator in cuprate superconductors. In multiple-layer FeSe/STO films,
high-Tc superconductivity occurs by suppressing the nematic order in the parent
compound with electron doping. The single-layer FeSe/STO films represent the
first clear case in the iron-based superconductors that the parent compound is
an insulator. Our observations of the unique parent state and doping evolution
in the single-layer FeSe/STO films provide key insight in understanding its
record high-Tc superconductivity. They also provide a new route of realizing
superconductivity in iron-based superconductors that is common in high
temperature cuprate superconductors. | | Source: | arXiv, 1904.4662 | | Services: | Forum | Review | PDF | Favorites | |
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