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The Drude model describes the free-electron conduction in simple metals, governed by the freedom thatthe mobile electrons have within the material. In strongly correlated systems, however, a significant deviationof the optical conductivity from the simple metallic Drude behavior is observed. Here, we investigate theoptical conductivity of the heavy-fermion system CeCu6−xAux, using time-resolved, phase-sensitive terahertzspectroscopy. The terahertz electric field creates two types of excitationsdoi:10.5445/ir/1000129762 fatcat:yqhbefvubndrnj4plstk2ngzg4