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High temperature superconductivity at FeSe/LaFeO3 interface

Author

Listed:
  • 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
    Shanghai Research Center for Quantum Sciences)

  • 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
    Shanghai Research Center for Quantum Sciences)

  • Tong Zhang

    (Laboratory of Advanced Materials, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University
    Shanghai Research Center for Quantum Sciences)

  • 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
    Shanghai Research Center for Quantum Sciences)

  • Donglai Feng

    (Shanghai Research Center for Quantum Sciences
    Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China
    Collaborative Innovation Center of Advanced Microstructures)

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.

Suggested Citation

  • 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, 2021. "High temperature superconductivity at FeSe/LaFeO3 interface," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26201-2
    DOI: 10.1038/s41467-021-26201-2
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    References listed on IDEAS

    as
    1. Defa Liu & Wenhao Zhang & Daixiang Mou & Junfeng He & Yun-Bo Ou & Qing-Yan Wang & Zhi Li & Lili Wang & Lin Zhao & Shaolong He & Yingying Peng & Xu Liu & Chaoyu Chen & Li Yu & Guodong Liu & Xiaoli Dong, 2012. "Electronic origin of high-temperature superconductivity in single-layer FeSe superconductor," Nature Communications, Nature, vol. 3(1), pages 1-6, January.
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    4. M. Yi & Z-K Liu & Y. Zhang & R. Yu & J.-X. Zhu & J.J. Lee & R.G. Moore & F.T. Schmitt & W. Li & S.C. Riggs & J.-H. Chu & B. Lv & J. Hu & M. Hashimoto & S.-K. Mo & Z. Hussain & Z.Q. Mao & C.W. Chu & I., 2015. "Observation of universal strong orbital-dependent correlation effects in iron chalcogenides," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
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