Oxygen vacancy modulated superconductivity in monolayer FeSe on SrTi O3-δ

Guanming Gong; Haohao Yang; Qinghua Zhang; Cui Ding; Jingsong Zhou; Yujie Chen; Fanqi Meng; Zhiyu Zhang; Wenfeng Dong; Fawei Zheng; Ping Zhang; Lexian Yang; Lin Gu; Qi Kun Xue; Lili Wang

doi:10.1103/PhysRevB.100.224504

Oxygen vacancy modulated superconductivity in monolayer FeSe on SrTi O3-δ

Guanming Gong, Haohao Yang, Qinghua Zhang, Cui Ding, Jingsong Zhou, Yujie Chen, Fanqi Meng, Zhiyu Zhang, Wenfeng Dong, Fawei Zheng, Ping Zhang, Lexian Yang, Lin Gu, Qi Kun Xue, Lili Wang^*

^*Corresponding author for this work

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

21 Citations (Scopus)

Abstract

The monolayer FeSe on SrTiO3-δ exhibits a twofold enlarged pairing gap compared with other electron-doped FeSe, which is postulated to originate from cooperative effects of interface charge transfer and electron-boson interaction that relate closely to surface oxygen vacancies in SrTiO3. We create gradient oxygen vacancies on the surface of SrTiO3-δ substrates using direct current heating. Combining spatially resolved spectroscopy characterizations, we disclose gradient pairing gaps but negligible doping variation in monolayer FeSe on such substrates. As oxygen vacancy concentration gradually increases from the anode to cathode region, the pairing gap increases from 12 to 17 meV, right beyond the values of electron-doped FeSe. This modulation provides a platform for spatially resolved investigations to unveil the interplay between electronic correlation and electron-phonon interaction and their cooperation to drive superconductivity.

Original language	English
Article number	224504
Journal	Physical Review B
Volume	100
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.100.224504
Publication status	Published - 5 Dec 2019
Externally published	Yes

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10.1103/PhysRevB.100.224504

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title = "Oxygen vacancy modulated superconductivity in monolayer FeSe on SrTi O3-δ",

abstract = "The monolayer FeSe on SrTiO3-δ exhibits a twofold enlarged pairing gap compared with other electron-doped FeSe, which is postulated to originate from cooperative effects of interface charge transfer and electron-boson interaction that relate closely to surface oxygen vacancies in SrTiO3. We create gradient oxygen vacancies on the surface of SrTiO3-δ substrates using direct current heating. Combining spatially resolved spectroscopy characterizations, we disclose gradient pairing gaps but negligible doping variation in monolayer FeSe on such substrates. As oxygen vacancy concentration gradually increases from the anode to cathode region, the pairing gap increases from 12 to 17 meV, right beyond the values of electron-doped FeSe. This modulation provides a platform for spatially resolved investigations to unveil the interplay between electronic correlation and electron-phonon interaction and their cooperation to drive superconductivity.",

author = "Guanming Gong and Haohao Yang and Qinghua Zhang and Cui Ding and Jingsong Zhou and Yujie Chen and Fanqi Meng and Zhiyu Zhang and Wenfeng Dong and Fawei Zheng and Ping Zhang and Lexian Yang and Lin Gu and Xue, {Qi Kun} and Lili Wang",

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day = "5",

doi = "10.1103/PhysRevB.100.224504",

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T1 - Oxygen vacancy modulated superconductivity in monolayer FeSe on SrTi O3-δ

AU - Gong, Guanming

AU - Yang, Haohao

AU - Zhang, Qinghua

AU - Ding, Cui

AU - Zhou, Jingsong

AU - Chen, Yujie

AU - Meng, Fanqi

AU - Zhang, Zhiyu

AU - Dong, Wenfeng

AU - Zheng, Fawei

AU - Zhang, Ping

AU - Yang, Lexian

AU - Gu, Lin

AU - Xue, Qi Kun

AU - Wang, Lili

PY - 2019/12/5

Y1 - 2019/12/5

N2 - The monolayer FeSe on SrTiO3-δ exhibits a twofold enlarged pairing gap compared with other electron-doped FeSe, which is postulated to originate from cooperative effects of interface charge transfer and electron-boson interaction that relate closely to surface oxygen vacancies in SrTiO3. We create gradient oxygen vacancies on the surface of SrTiO3-δ substrates using direct current heating. Combining spatially resolved spectroscopy characterizations, we disclose gradient pairing gaps but negligible doping variation in monolayer FeSe on such substrates. As oxygen vacancy concentration gradually increases from the anode to cathode region, the pairing gap increases from 12 to 17 meV, right beyond the values of electron-doped FeSe. This modulation provides a platform for spatially resolved investigations to unveil the interplay between electronic correlation and electron-phonon interaction and their cooperation to drive superconductivity.

AB - The monolayer FeSe on SrTiO3-δ exhibits a twofold enlarged pairing gap compared with other electron-doped FeSe, which is postulated to originate from cooperative effects of interface charge transfer and electron-boson interaction that relate closely to surface oxygen vacancies in SrTiO3. We create gradient oxygen vacancies on the surface of SrTiO3-δ substrates using direct current heating. Combining spatially resolved spectroscopy characterizations, we disclose gradient pairing gaps but negligible doping variation in monolayer FeSe on such substrates. As oxygen vacancy concentration gradually increases from the anode to cathode region, the pairing gap increases from 12 to 17 meV, right beyond the values of electron-doped FeSe. This modulation provides a platform for spatially resolved investigations to unveil the interplay between electronic correlation and electron-phonon interaction and their cooperation to drive superconductivity.

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U2 - 10.1103/PhysRevB.100.224504

DO - 10.1103/PhysRevB.100.224504

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VL - 100

JO - Physical Review B

JF - Physical Review B

IS - 22

M1 - 224504

ER -

Oxygen vacancy modulated superconductivity in monolayer FeSe on SrTi O3-δ

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