Magnetic excitation in the Ni-overdoped BaFe$_{2}$As$_{2}$

We use neutron scattering to systematically investigate the evolution of spin excitations in Ni-doped BaFe2As2.~ Previous works on underdoped and optimally doped materials have found evidence for spin gap and neutron spin resonance.~ We use flux method to grow overdoped material approaching to the nonsuperconducting regime.~ We have carried out inelastic neutron scattering measurements on spin and lattice excitations of the overdoped BaFe$_{1.8}$Ni$_{0.2}$As$_{2}$ ($T_{c} \quad \sim $5 K) and the outcome of these investigations will be report.