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Far-infrared optical conductivity of CeCu<sub>2</sub>Si<sub>2</sub>
We investigated the optical reflectivity of the heavy-fermion metal CeCu 2 Si 2 in the energy range 3 meV -30 eV for temperatures between 4K -300K.The results for the charge dynamics indicate a behavior that is expected for the formation of a coherent heavy quasiparticle state: Upon cooling the spectra …