Structure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors
- Fudan Univ., Shanghai (China). State Key Laboratory of Surface Physics and Department of Physics
- Technical University of Munich (Germany). Heinz Maier-Leibnitz Zentrum (MLZ)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States).Quantum Condensed Matter Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
- Beijing Normal University (China). Department of Physics and Center for Advanced Quantum Studies
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computer Science and Mathematics Division, Center for Nanophase Materials Sciences, and Materials Science and Technology Division
- Fudan Univ., Shanghai (China). State Key Laboratory of Surface Physics and Department of Physics; Collaborative Innovation Center of Advanced Microstructures, Nanjing (China)
Heavily electron-doped iron-selenide high-transition-temperature (high-Tc) superconductors, which have no hole Fermi pockets, but have a notably high Tc, 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 (Tc = 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 Tc in these materials.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1399978
- Journal Information:
- Nature Communications, Vol. 8, Issue 1; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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Fermi surface pockets in electron-doped iron superconductor by Lifshitz transition
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Coexistence of Ferromagnetic and Stripe-Type Antiferromagnetic Spin Fluctuations in
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journal | May 2019 |
Neutron Spin Resonance in the Heavily Hole-Doped Superconductor
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journal | January 2020 |
Nematicity and superconductivity in orthorhombic superconductor
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journal | November 2018 |
Fermi surface pockets in electron-doped iron superconductor by Lifshitz transition | text | January 2018 |
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