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06 October 2022
 
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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
AbstractThe 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
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