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

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

doi:10.1038/s41467-017-00162-x

Title: Structure of spin excitations in heavily electron-doped Li_0.8Fe_0.2ODFeSe superconductors

Journal Article · 25 July 2017 · Nature Communications

DOI: https://doi.org/10.1038/s41467-017-00162-x · OSTI ID:1399978

Pan, Bingying ^[1];

^[1]; Hu, Die ^[1]; Feng, Yu ^[1];

^[2];

^[3]; Wang, Qisi ^[1]; Hao, Yiqing ^[1]; Wo, Hongliang ^[1]; Yin, Zhiping ^[4]; Maier, T. A. ^[5];

^[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)

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 Li_0.8Fe_0.2ODFeSe (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.

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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

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Cited by: 32 works

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