Enhanced low-energy magnetic excitations evidencing the Cu-induced localization in an Fe-based superconductor Fe${}_{0.98}$Te${}_{0.5}$Se${}_{0.5}$

Jinghui Wang, Song Bao, Yanyan Shangguan +11

We have performed inelastic neutron scattering measurements on optimally-doped Fe${}_{0.98}$Te${}_{0.5}$Se${}_{0.5}$ and 10% Cu-doped Fe${}_{0.88}$Cu${}_{0.1}$Te${}_{0.5}$Se${}_{0.5}$ to investi…