Neutron-Scattering Measurements of Spin Excitations in LaFeAsO andBa(Fe0.953Co0.047)2As2: Evidence for a Sharp Enhancement of Spin Fluctuations by Nematic Order

Neutron-Scattering Measurements of Spin Excitations in LaFeAsO andBa(Fe0.953Co0.047)2As2: Evidence for a Sharp Enhancement of Spin Fluctuations by Nematic Order