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Atomic-scale observation of localized phonons at FeSe/SrTiO3 interface

Author

Listed:
  • Ruochen Shi

    (Peking University
    Peking University)

  • Qize Li

    (Peking University
    Peking University
    University of California at Berkeley)

  • Xiaofeng Xu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Bo Han

    (Peking University
    Peking University)

  • Ruixue Zhu

    (Peking University
    Peking University)

  • Fachen Liu

    (Peking University
    Peking University)

  • Ruishi Qi

    (University of California at Berkeley)

  • Xiaowen Zhang

    (Peking University
    Peking University)

  • Jinlong Du

    (Peking University)

  • Ji Chen

    (Peking University
    Collaborative Innovation Center of Quantum Matter
    Peking University)

  • Dapeng Yu

    (Peking University
    Southern University of Science and Technology
    Hefei National Laboratory)

  • Xuetao Zhu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Jiandong Guo

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Peng Gao

    (Peking University
    Peking University
    Collaborative Innovation Center of Quantum Matter
    Peking University)

Abstract

In single unit-cell FeSe grown on SrTiO3, the superconductivity transition temperature features a significant enhancement. Local phonon modes at the interface associated with electron-phonon coupling may play an important role in the interface-induced enhancement. However, such phonon modes have eluded direct experimental observations. The complicated atomic structure of the interface brings challenges to obtain the accurate structure-phonon relation knowledge. Here, we achieve direct characterizations of atomic structure and phonon modes at the FeSe/SrTiO3 interface with atomically resolved imaging and electron energy loss spectroscopy in an electron microscope. We find several phonon modes highly localized (~1.3 nm) at the unique double layer Ti-O terminated interface, one of which (~ 83 meV) engages in strong interactions with the electrons in FeSe based on ab initio calculations. This finding of the localized interfacial phonon associated with strong electron-phonon coupling provides new insights into understanding the origin of superconductivity enhancement at the FeSe/SrTiO3 interface.

Suggested Citation

  • Ruochen Shi & Qize Li & Xiaofeng Xu & Bo Han & Ruixue Zhu & Fachen Liu & Ruishi Qi & Xiaowen Zhang & Jinlong Du & Ji Chen & Dapeng Yu & Xuetao Zhu & Jiandong Guo & Peng Gao, 2024. "Atomic-scale observation of localized phonons at FeSe/SrTiO3 interface," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47688-5
    DOI: 10.1038/s41467-024-47688-5
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