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Incommensurate smectic phase in close proximity to the high- T ~c~ superconductor FeSe/SrTiO~3~ by Yonghao Yuan; Xuemin Fan; Xintong Wang; Ke He; Yan Zhang; Qi-Kun Xue; Wei Li is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

What is Incommensurate smectic phase in close proximity to the high- T ~c~ superconductor FeSe/SrTiO~3~ about?

Superconductivity is significantly enhanced in monolayer FeSe grown on SrTiO~3~, but not for multilayer films, in which large strength of nematicity develops. However, the link between the high-transition temperature superconductivity in monolayer and the correlation related nematicity in multilayer FeSe films is not well understood. Here, we use low-temperature scanning tunneling microscopy to study few-layer FeSe thin films grown by molecular beam epitaxy. We observe an incommensurate long-range smectic phase, which solely appears in bilayer FeSe films. The smectic order still locally exists and gradually fades away with increasing film thickness, while it suddenly vanishes in monolayer FeSe, indicative of an abrupt smectic phase transition. Surface alkali-metal doping can suppress the smectic phase and induce high-__T__~c~ superconductivity in bilayer FeSe. Our observations provide evidence that the monolayer FeSe is in close proximity to the smectic phase, and its superconductivity is likely enhanced by this electronic instability as well.

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Author

Yonghao Yuan; Xuemin Fan; Xintong Wang; Ke He; Yan Zhang; Qi-Kun Xue; Wei Li

Publisher

Springer Science and Business Media LLC

Published

2021

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)