Abstract
The anisotropic conductivity of thin ${\mathrm{Nd}}_{1.85}{\mathrm{Ce}}_{0.15}{\mathrm{CuO}}_{4\ensuremath{-}\ensuremath{\delta}}$ films was measured in the frequency range $8<\ensuremath{\nu}<40 {\mathrm{cm}}^{\ensuremath{-}1}$ and for temperatures $4<T<300 \mathrm{K}.$ A tilted sample geometry made it possible to extract both in-plane and c-axis properties. The in-plane quasiparticle scattering rate remains unchanged as the sample becomes superconducting. The temperature dependence of the in-plane conductivity is reasonably well described using the Born limit for a d-wave superconductor. Below ${T}_{C},$ the c-axis dielectric constant ${\ensuremath{\varepsilon}}_{1c}$ changes sign at the screened c-axis plasma frequency. The temperature dependence of the c-axis conductivity closely follows the linear in T behavior within the plane.
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