Effect of electron-doping on spin excitations of underdoped BaFe${}_{1.96}$Ni${}_{0.04}$As${}_2$

Leland W. Harriger, Astrid Schneidewind, Shiliang Li +8

We use neutron scattering to study magnetic order and spin excitations in BaFe${}_{1.96}$Ni${}_{0.04}$As${}_2$. On cooling, the system first changes the lattice symmetry from tetragona…