  The microscopic deformation mechanism of charged colloidal glasses with
extended-range interactions under shear is investigated by in-situ small-angle
neutron scattering, and a dynamically correlated region (DCR) is identified.
This short-lived region provides the resistance to the configurational
rearrangement imposed by the external deformation, as evidenced by the
evolution of the size of DCR in the shear thinning regime and the quantitative
agreement between the local stress sustained by DCR and the macroscopic stress
from rheological measurements at low and mediate shear rates. This finding
suggests that DCR is an important quantity for microscopically addressing the
flow and deformation behavior of strongly interacting colloids.
