Abstract
The reflectivities of the mixed-valent compounds Ce${\mathrm{Sn}}_{3}$ and Ce${\mathrm{Pd}}_{3}$ have been measured to obtain the optical conductivity as a function of temperature. Both compounds show a renormalization of the low-energy Drude conductivity at low temperatures. In addition, for the low-carrier-density compound Ce${\mathrm{Pd}}_{3}$, but not for high-carrier-density Ce${\mathrm{Sn}}_{3}$, substantial spectral weight lost from the conductivity below 1000 ${\mathrm{cm}}^{\ensuremath{-}1}$ reappears in the frequency range 2000-10 000 ${\mathrm{cm}}^{\ensuremath{-}1}$, indicating that Ce${\mathrm{Pd}}_{3}$ can be considered a lightly doped Kondo insulator.
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