Spectroscopic evidence of superconductivity pairing at 83 K in single-layer FeSe/SrTiO3 films

Yu Xu; Hongtao Rong; Qingyan Wang; Dingsong Wu; Yong Hu; Yongqing Cai; Qiang Gao; Hongtao Yan; Cong Li; Chaohui Yin; Hao Chen; Jianwei Huang; Zhihai Zhu; Yuan Huang; Guodong Liu; Zuyan Xu; Lin Zhao; X. J. Zhou

doi:10.1038/s41467-021-23106-y

Spectroscopic evidence of superconductivity pairing at 83 K in single-layer FeSe/SrTiO₃ films

Yu Xu, Hongtao Rong, Qingyan Wang^*, Dingsong Wu, Yong Hu, Yongqing Cai, Qiang Gao, Hongtao Yan, Cong Li, Chaohui Yin, Hao Chen, Jianwei Huang, Zhihai Zhu, Yuan Huang, Guodong Liu, Zuyan Xu, Lin Zhao^*, X. J. Zhou^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

Abstract

Single-layer FeSe films grown on the SrTiO₃ substrate (FeSe/STO) have attracted much attention because of their possible record-high superconducting critical temperature (T_c) and distinct electronic structures. However, it has been under debate on how high its T_c can really reach due to the inconsistency of the results from different measurements. Here we report spectroscopic evidence of superconductivity pairing at 83 K in single-layer FeSe/STO films. By preparing high-quality single-layer FeSe/STO films, we observe strong superconductivity-induced Bogoliubov back-bending bands that extend to rather high binding energy ~ 100 meV by high-resolution angle-resolved photoemission measurements. They provide a new definitive benchmark of superconductivity pairing that is directly observed up to 83 K. Moreover, we find that the pairing state can be further divided into two temperature regions. These results indicate that either T_c as high as 83 K is achievable, or there is a pseudogap formation from superconductivity fluctuation in single-layer FeSe/STO films.

Original language	English
Article number	2840
Journal	Nature Communications
Volume	12
Issue number	1
DOIs	https://doi.org/10.1038/s41467-021-23106-y
Publication status	Published - 1 Dec 2021
Externally published	Yes

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title = "Spectroscopic evidence of superconductivity pairing at 83 K in single-layer FeSe/SrTiO3 films",

abstract = "Single-layer FeSe films grown on the SrTiO3 substrate (FeSe/STO) have attracted much attention because of their possible record-high superconducting critical temperature (Tc) and distinct electronic structures. However, it has been under debate on how high its Tc can really reach due to the inconsistency of the results from different measurements. Here we report spectroscopic evidence of superconductivity pairing at 83 K in single-layer FeSe/STO films. By preparing high-quality single-layer FeSe/STO films, we observe strong superconductivity-induced Bogoliubov back-bending bands that extend to rather high binding energy ~ 100 meV by high-resolution angle-resolved photoemission measurements. They provide a new definitive benchmark of superconductivity pairing that is directly observed up to 83 K. Moreover, we find that the pairing state can be further divided into two temperature regions. These results indicate that either Tc as high as 83 K is achievable, or there is a pseudogap formation from superconductivity fluctuation in single-layer FeSe/STO films.",

author = "Yu Xu and Hongtao Rong and Qingyan Wang and Dingsong Wu and Yong Hu and Yongqing Cai and Qiang Gao and Hongtao Yan and Cong Li and Chaohui Yin and Hao Chen and Jianwei Huang and Zhihai Zhu and Yuan Huang and Guodong Liu and Zuyan Xu and Lin Zhao and Zhou, {X. J.}",

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doi = "10.1038/s41467-021-23106-y",

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T1 - Spectroscopic evidence of superconductivity pairing at 83 K in single-layer FeSe/SrTiO3 films

AU - Xu, Yu

AU - Rong, Hongtao

AU - Wang, Qingyan

AU - Wu, Dingsong

AU - Hu, Yong

AU - Cai, Yongqing

AU - Gao, Qiang

AU - Yan, Hongtao

AU - Li, Cong

AU - Yin, Chaohui

AU - Chen, Hao

AU - Huang, Jianwei

AU - Zhu, Zhihai

AU - Huang, Yuan

AU - Liu, Guodong

AU - Xu, Zuyan

AU - Zhao, Lin

AU - Zhou, X. J.

PY - 2021/12/1

Y1 - 2021/12/1

N2 - Single-layer FeSe films grown on the SrTiO3 substrate (FeSe/STO) have attracted much attention because of their possible record-high superconducting critical temperature (Tc) and distinct electronic structures. However, it has been under debate on how high its Tc can really reach due to the inconsistency of the results from different measurements. Here we report spectroscopic evidence of superconductivity pairing at 83 K in single-layer FeSe/STO films. By preparing high-quality single-layer FeSe/STO films, we observe strong superconductivity-induced Bogoliubov back-bending bands that extend to rather high binding energy ~ 100 meV by high-resolution angle-resolved photoemission measurements. They provide a new definitive benchmark of superconductivity pairing that is directly observed up to 83 K. Moreover, we find that the pairing state can be further divided into two temperature regions. These results indicate that either Tc as high as 83 K is achievable, or there is a pseudogap formation from superconductivity fluctuation in single-layer FeSe/STO films.

AB - Single-layer FeSe films grown on the SrTiO3 substrate (FeSe/STO) have attracted much attention because of their possible record-high superconducting critical temperature (Tc) and distinct electronic structures. However, it has been under debate on how high its Tc can really reach due to the inconsistency of the results from different measurements. Here we report spectroscopic evidence of superconductivity pairing at 83 K in single-layer FeSe/STO films. By preparing high-quality single-layer FeSe/STO films, we observe strong superconductivity-induced Bogoliubov back-bending bands that extend to rather high binding energy ~ 100 meV by high-resolution angle-resolved photoemission measurements. They provide a new definitive benchmark of superconductivity pairing that is directly observed up to 83 K. Moreover, we find that the pairing state can be further divided into two temperature regions. These results indicate that either Tc as high as 83 K is achievable, or there is a pseudogap formation from superconductivity fluctuation in single-layer FeSe/STO films.

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Spectroscopic evidence of superconductivity pairing at 83 K in single-layer FeSe/SrTiO₃ films

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