Structure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors
Abstract
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.
- Authors:
-
[1];
[2];
[3];
[6]
- 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)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1399978
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Pan, Bingying, Shen, Yao, Hu, Die, Feng, Yu, Park, J. T., Christianson, A. D., Wang, Qisi, Hao, Yiqing, Wo, Hongliang, Yin, Zhiping, Maier, T. A., and Zhao, Jun. Structure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors. United States: N. p., 2017.
Web. doi:10.1038/s41467-017-00162-x.
Pan, Bingying, Shen, Yao, Hu, Die, Feng, Yu, Park, J. T., Christianson, A. D., Wang, Qisi, Hao, Yiqing, Wo, Hongliang, Yin, Zhiping, Maier, T. A., & Zhao, Jun. Structure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors. United States. https://doi.org/10.1038/s41467-017-00162-x
Pan, Bingying, Shen, Yao, Hu, Die, Feng, Yu, Park, J. T., Christianson, A. D., Wang, Qisi, Hao, Yiqing, Wo, Hongliang, Yin, Zhiping, Maier, T. A., and Zhao, Jun. Tue .
"Structure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors". United States. https://doi.org/10.1038/s41467-017-00162-x. https://www.osti.gov/servlets/purl/1399978.
@article{osti_1399978,
title = {Structure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors},
author = {Pan, Bingying and Shen, Yao and Hu, Die and Feng, Yu and Park, J. T. and Christianson, A. D. and Wang, Qisi and Hao, Yiqing and Wo, Hongliang and Yin, Zhiping and Maier, T. A. and Zhao, Jun},
abstractNote = {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.},
doi = {10.1038/s41467-017-00162-x},
journal = {Nature Communications},
number = 1,
volume = 8,
place = {United States},
year = {Tue Jul 25 00:00:00 EDT 2017},
month = {Tue Jul 25 00:00:00 EDT 2017}
}
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Fig. 1: Magnetic resonant mode in Li0.8Fe0.2ODFeSe (Tc= 41 K). a Energy dependence of spin excitations for Li0.8Fe0.2ODFeSe at Q= (0.50, 0.69, 0) in the superconducting state (T= 2.6 K) and normal state (45 K). The solid and open circles correspond to the data collected at final energies of Ef=more »
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