Q Dependence of Magnetic Resonance Mode on FeTe${}_{0.5}$Se${}_{0.5}$ Studied by Inelastic Neutron Scattering

Abstract

Inelastic neutron scattering measurements have been performed on a superconducting single crystal FeTe${}_{0.5}$Se${}_{0.5}$ to examine the $\mathbf{Q}$-dependent enhancement of the dynamical structure factor, $S(\mathbf{Q},E)$, from $\mathbf{Q}$ = (0, 0) to ($\pi$, $\pi$), including ($\pi$, 0) in the superconducting state. In most of iron-based superconductors, $S(\mathbf{Q},E)$ is enhanced at $\mathbf{Q}$ = ($\pi$, 0), where the "magnetic resonance mode" is commonly observed in the unfolded Brillouin zone. Constant-$E$ cuts of $S(\mathbf{Q},E)$ suggest that the enhancement is not uniform in the magnetic excitation, and limited around $\mathbf{Q}$ = ($\pi$, 0). This result is consistent with the theoretical simulation of the magnetic resonance mode due to the Bardeen$-$Cooper$-$Schrieffer coherence factor with the sign-reversing order parameter of s${}_{\pm }$ wave.

10 pages, 3 figures

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