Degradation of superconductivity and spin fluctuations by electron over-doping in LaFeAsO${}_{1-x}$F${}_x$

Abstract

Low energy spin fluctuations are studied for the electron-doped Fe-based superconductor LaFeAsO(1-x)F(x) by inelastic neutron scattering up to the energy transfer of w = 15 meV using polycrystalline samples. Superconducting samples (x=0.057, Tc=25 K and x=0.082, Tc=29 K) show dynamical spin susceptibility chi"(w) almost comparable with the parent sample's. However chi"(w) is almost vanished in the x=0.158 sample where the superconductivity is highly suppressed. These results are compatible with the theoretical suggestions that the spin fluctuation plays an important role for the superconductivity.

5 pages, 4 figures. New Figs. 3 and 4 with absolute units

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• Doping Dependence of Spin Dynamics in Electron-Doped Ba(Fe1-xCox)2As2
• Andreev spectroscopy of iron-based superconductors: temperature dependence of the order parameters and scaling of the ${\Delta }_{L,S}$ with $T_C$
• Neutron spin resonance in the 112-type iron-based superconductor
• Switching of intra-orbital spin excitations in electron-doped iron pnictide superconductors
• Spin Resonance in the New-Structure-Type Iron-Based Superconductor CaKFe4As4
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• On the Structure of Superconducting Order Parameter in High-Temperature Fe-Based Superconductors
• Soft and Isotropic Phonons in PrFeAsO_{1-y}
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• Experimental evidence of $T_c$ enhancement without the influence of spin fluctuations: NMR study on LaFeAsO_{1-x}H_x under a pressure of 3.0 GPa
• Synthesis of ErFeAsO-based superconductors by hydrogen doping method
• Magnetism dependent phonon anomaly in LaFeAsO observed via inelastic x-ray scattering
• Anisotropic magnetoelastic coupling in single-crystalline CeFeAsO as seen via high-resolution x-ray diffraction
• Nodeless two-gap superconductivity in stoichiometric iron pnictide LiFeAs
• High-energy spin fluctuation in low-$T_{\mathrm{c}}$ iron-based superconductor LaFePO${}_{0.9}$
• Absence of strong magnetic fluctuations in the iron phosphide superconductors LaFePO and Sr2ScO3FeP
• Quantum dynamics of hydrogen in iron-based superconductor LaFeAsO0.9D0.1 measured with inelastic neutron spectroscopy
• No anomalous spin fluctuation in optimally doped and overdoped iron-based oxypnictide superconductors LaFeAsO${}_{1-x}$F${}_x$ probed by muon spin relaxation
• Cooperative order in the weakly magnetic domain of LaFeAsO${}_{1-x}$F${}_x$ near the doping phase boundary
• Strong spin resonance on BaFe2(As0.65P0.35)2 with Tc = 30 K