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We discuss the charge carrier dynamics of the heavy-fermion compoundCeCoIn$_5$ in the metallic regime measured by means of quasi-optical THzspectroscopy. The transmittance of electromagnetic radiation through aCeCoIn$_5$ thin film on a dielectric substrate is analyzed in thesingle-particle Drude framework. We discuss the temperature dependence of theelectronic properties, such as the scattering time and dc-conductivity andcompare with transport measurements of the sheet resistance. Towards lowtemperatures, we find an increasing mismatch between the results from transportand Drude-analyzed optical measurements and a growing incapability of thesimple single-particle picture describing the charge dynamics, likely caused bythe evolving heavy-fermion nature of the correlated electron system.

Charge Carrier Dynamics of the Heavy Fermion Metal CeCoIn$_5$ Probed by THz Spectroscopy