  4d transition metal perovskite oxides serve as suitable testbeds for the
study of strongly correlated metallic properties. Among these, $SrMoO_{3}$
(SMO) exhibits remarkable electrical conductivity at room temperature. The
temperature-dependent resistivity $(\rho(T))$ exhibits a Fermi-liquid behavior
below the transition temperature $T^{*}$, reflecting the dominant
electron-electron interaction. Above $T^{*}$, electron-phonon interaction
becomes more appreciable. In this study, we employed the power-law scaling of
$\rho(T)$ to rigorously determine the $T^{*}$. We further demonstrate that the
$T^{*}$ can be modified substantially by ~40 K in epitaxial thin films. It
turns out that the structural quality determines $T^{*}$. Whereas the plasma
frequency could be tuned by the change in the electron-electron interaction via
the effective mass enhancement, we show that the plasmonic properties are more
directly governed by the electron-impurity scattering. The facile control of
the electron scattering mechanism through structural quality modulation can be
useful for plasmonic sensing applications in the visible region.
