Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6

Yiming Qiu, Wei Bao, Yang Zhao +9

Neutron scattering is used to probe magnetic excitations in FeSe_{0.4}Te_{0.6} (T_c=14 K). Low energy spin fluctuations are found with a characteristic wave vector $(0.5,0.5,L)$ th…