Polarized neutron scattering studies of magnetic excitations in iron-selenide superconductor Li <sub>0.8</sub> Fe <sub>0.2</sub> ODFeSe ( <i>T</i> <sub>c</sub> <b>=</b> 41 K)
Поляризованное нейтронное рассеяние магнитных возбуждений в железоселенидном сверхпроводнике Li0.8Fe0.2ODFeSe (Tc = 41 K)
2021-08-12
SCID: 54.1/8kpvvhpy
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Li0.8Fe0.2ODFeSeisotropic spin excitationspolarized neutron scatteringspin resonance 21 meVsuperconducting transition Tc = 41 K
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Abstract (AI)
Abstract We report polarized neutron scattering measurements of the low energy spin fluctuations of the iron-selenide superconductor Li 0.8 Fe 0.2 ODFeSe below and above its superconducting transition temperature T c = 41 K. Our experiments confirmed that the resonance mode near 21 meV is magnetic. Moreover, the spin excitations are essentially isotropic in spin space at 5 ⩽ E ⩽ 29 meV in the superconducting and normal states. Our results suggest that the resonance mode in iron-based superconductors becomes isotropic when the influence of spin–orbit coupling and magnetic/nematic order is minimized, similar to those observed in cuprate superconductors.
Key Findings
1
Isotropy of the resonance mode occurs in a system with minimized spin-orbit coupling and magnetic/nematic order.
2
Low-energy spin excitations are essentially isotropic in spin space between 5 and 29 meV in both superconducting and normal states.
3
Polarized neutron scattering confirms the resonance mode near 21 meV in Li0.8Fe0.2ODFeSe is magnetic.
4
The observed isotropic resonance behavior in this iron-selenide resembles that seen in cuprate superconductors.
Research Object
Iron-selenide superconductor Li0.8Fe0.2ODFeSe investigated by polarized neutron scattering
Research Subject
Low-energy magnetic spin excitations and the magnetic resonance mode (near 21 meV), including their spin-space isotropy across superconducting and normal states and dependence on spin-orbit and magnetic/nematic order
Publication Details
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2021-08-12
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