  We present an optical conductivity study of the multifold semimetal PdGa,
performed in a broad spectral range (100 - 20000 cm-1; 12 meV - 2.5 eV) down to
T = 10 K. The conductivity at frequencies below 4000 cm-1 is dominated by free
carriers while at higher frequencies interband transitions provide the major
contribution. The spectra do not demonstrate a significant temperature
evolution: only the intraband part changes as a function of temperature with
the plasma frequency remaining constant. The interband contribution to the
conductivity exhibits a broad peak at around 5500 cm-1 and increases basically
monotonously at frequencies above 9000 cm-1. The band-structure-based
computations reproduce these features of the interband conductivity and predict
its linear-in-frequency behavior as frequency diminishes.
