%0 Journal Article
%T Q Dependence of Magnetic Resonance Mode on FeTe0.5Se0.5 Studied by Inelastic Neutron Scattering
%J Condensed Matter | An Open Access Journal from MDPI
%D 2019
%R https://doi.org/10.3390/condmat4030069
%X Inelastic neutron scattering measurements have been performed on a superconducting single crystal FeTe 0.5 Se 0.5 to examine the Q -dependent enhancement of the dynamical structure factor, S ( Q , E ) , from Q = (0, 0) to ( ¦Ð , ¦Ð ), including ( ¦Ð , 0) in the superconducting state. In most of iron-based superconductors, S ( Q , E ) is enhanced at Q = ( ¦Ð , 0), where the ¡°magnetic resonance mode¡± is commonly observed in the unfolded Brillouin zone. Constant- E cuts of S ( Q , E ) suggest that the enhancement is not uniform in the magnetic excitation, and limited around Q = ( ¦Ð , 0). This result is consistent with the theoretical simulation of the magnetic resonance mode due to the Bardeen¨CCooper¨CSchrieffer coherence factor with the sign-reversing order parameter of s ¡À wave. View Full-Tex
%U https://www.mdpi.com/2410-3896/4/3/69