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Structure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors

Author

Listed:
  • Bingying Pan

    (Fudan University)

  • Yao Shen

    (Fudan University)

  • Die Hu

    (Fudan University)

  • Yu Feng

    (Fudan University)

  • J. T. Park

    (Technische Universität München)

  • A. D. Christianson

    (Oak Ridge National Laboratory
    University of Tennessee)

  • Qisi Wang

    (Fudan University)

  • Yiqing Hao

    (Fudan University)

  • Hongliang Wo

    (Fudan University)

  • Zhiping Yin

    (Beijing Normal University)

  • T. A. Maier

    (Oak Ridge National Laboratory
    Oak Ridge National Laboratory)

  • Jun Zhao

    (Fudan University
    Collaborative Innovation Center of Advanced Microstructures)

Abstract

Heavily electron-doped iron-selenide high-transition-temperature (high-T c) superconductors, which have no hole Fermi pockets, but have a notably high T c, have challenged the prevailing s ± pairing scenario originally proposed for iron pnictides containing both electron and hole pockets. The microscopic mechanism underlying the enhanced superconductivity in heavily electron-doped iron-selenide remains unclear. Here, we used neutron scattering to study the spin excitations of the heavily electron-doped iron-selenide material Li0.8Fe0.2ODFeSe (T c = 41 K). Our data revealed nearly ring-shaped magnetic resonant excitations surrounding (π, π) at ∼21 meV. As the energy increased, the spin excitations assumed a diamond shape, and they dispersed outward until the energy reached ∼60 meV and then inward at higher energies. The observed energy-dependent momentum structure and twisted dispersion of spin excitations near (π, π) are analogous to those of hole-doped cuprates in several aspects, thus implying that such spin excitations are essential for the remarkably high T c in these materials.

Suggested Citation

  • Bingying Pan & Yao Shen & Die Hu & Yu Feng & J. T. Park & A. D. Christianson & Qisi Wang & Yiqing Hao & Hongliang Wo & Zhiping Yin & T. A. Maier & Jun Zhao, 2017. "Structure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors," Nature Communications, Nature, vol. 8(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-00162-x
    DOI: 10.1038/s41467-017-00162-x
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    Cited by:

    1. Ziyuan Chen & Dong Li & Zouyouwei Lu & Yue Liu & Jiakang Zhang & Yuanji Li & Ruotong Yin & Mingzhe Li & Tong Zhang & Xiaoli Dong & Ya-Jun Yan & Dong-Lai Feng, 2023. "Charge order driven by multiple-Q spin fluctuations in heavily electron-doped iron selenide superconductors," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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