High temperature superconductivity at FeSe/LaFeO3 interface

Yuanhe Song, Zheng Chen, Qinghua Zhang, Haichao Xu, Xia Lou, Xiaoyang Chen, Xiaofeng Xu, Xuetao Zhu, Ran Tao, Tianlun Yu, Hao Ru, Yihua Wang, Tong Zhang, Jiandong Guo (), Lin Gu (), Yanwu Xie (), Rui Peng () and Donglai Feng ()
Additional contact information
Yuanhe Song: Laboratory of Advanced Materials, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University
Zheng Chen: Zhejiang University
Qinghua Zhang: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Haichao Xu: Laboratory of Advanced Materials, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University
Xia Lou: Laboratory of Advanced Materials, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University
Xiaoyang Chen: Laboratory of Advanced Materials, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University
Xiaofeng Xu: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Xuetao Zhu: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Ran Tao: Laboratory of Advanced Materials, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University
Tianlun Yu: Laboratory of Advanced Materials, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University
Hao Ru: Laboratory of Advanced Materials, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University
Yihua Wang: Laboratory of Advanced Materials, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University
Tong Zhang: Laboratory of Advanced Materials, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University
Jiandong Guo: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Lin Gu: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Yanwu Xie: Zhejiang University
Rui Peng: Laboratory of Advanced Materials, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University
Donglai Feng: Shanghai Research Center for Quantum Sciences

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Enormous enhancement of superconducting pairing temperature (Tg) to 65 K in FeSe/SrTiO3 has made it a spotlight. Despite the effort of interfacial engineering, FeSe interfaced with TiOx remains the unique case in hosting high Tg, hindering a decisive understanding on the general mechanism and ways to further improving Tg. Here we constructed a new high-Tg interface, single-layer FeSe interfaced with FeOx-terminated LaFeO3. Large superconducting gap and diamagnetic response evidence that the superconducting pairing can emerge near 80 K, highest amongst all-known interfacial superconductors. Combining various techniques, we reveal interfacial charge transfer and strong interfacial electron-phonon coupling (EPC) in FeSe/LaFeO3, showing that the cooperative pairing mechanism works beyond FeSe-TiOx. Intriguingly, the stronger interfacial EPC than that in FeSe/SrTiO3 is likely induced by the stronger interfacial bonding in FeSe/LaFeO3, and can explain the higher Tg according to recent theoretical calculations, pointing out a workable route in designing new interfaces to achieve higher Tg.

Date: 2021
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DOI: 10.1038/s41467-021-26201-2

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