Incommensurate itinerant antiferromagnetic excitations and spin resonance in the FeTe${}_{0.6}$Se${}_{0.4}$ superconductor

Abstract

We report on inelastic neutron scattering measurements that find incommensurate itinerant like magnetic excitations in the normal state of superconducting FeTe${}_{0.6}$Se${}_{0.4}$ (\Tc=14K) at wave-vector ${\mathbf{Q}}_{inc}=(1/2\pm \epsilon ,1/2\mp \epsilon )$ with $\epsilon$=0.09(1). In the superconducting state only the lower energy part of the spectrum shows significant changes by the formation of a gap and a magnetic resonance that follows the dispersion of the normal state excitations. We use a four band model to describe the Fermi surface topology of iron-based superconductors with the extended $s(\pm )$ symmetry and find that it qualitatively captures the salient features of these data.

7 pages and 5 figures

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