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The microscopic deformation mechanism of charged colloidal glasses withextended-range interactions under shear is investigated by in-situ small-angleneutron scattering, and a dynamically correlated region (DCR) is identified.This short-lived region provides the resistance to the configurationalrearrangement imposed by the external deformation, as evidenced by theevolution of the size of DCR in the shear thinning regime and the quantitativeagreement between the local stress sustained by DCR and the macroscopic stressfrom rheological measurements at low and mediate shear rates. This findingsuggests that DCR is an important quantity for microscopically addressing theflow and deformation behavior of strongly interacting colloids.

Dynamically Correlated Region in Sheared Colloidal Glasses Revealed by Neutron Scattering