Inelastic neutron scattering study on the resonance mode in an optimally doped superconductor LaFeAsO${}_{0.92}$F${}_{0.08}$

Abstract

An optimally doped iron-based superconductor LaFeAsO${}_{0.92}$F${}_{0.08}$ with $T_c=29$ K has been studied by inelastic powder neutron scattering. The magnetic excitation at $Q=1.15$ Å${}^{-1}$ is enhanced below $T_c$, leading to a peak at $E_{res}\sim 13$ meV as the resonance mode, in addition to the formation of a gap at low energy below the crossover energy ${\Delta }_c\sim 10meV$. The peak energy at $Q=1.15$ Å${}^{-1}$ corresponds to $5.2k_B{T}_c$ in good agreement with the other values of resonance mode observed in the various iron-based superconductors, even in the high-$T_c$ cuprates. Although the phonon density of states has a peak at the same energy as the resonance mode in the present superconductor, the $Q$-dependence is consistent with the resonance being of predominately magnetic origin.

4 pages, 5 Postscript figures

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