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Free keywords:
Binary alloys, Optical conductivity, Palladium alloys, Broad spectral, Free carriers, Frequency behavior, Higher frequencies, Inter-band transition, Plasma frequencies, Structure-based, Temperature evolution, Gallium alloys
Abstract:
We present an optical conductivity study of the multifold semimetal PdGa, performed in a broad spectral range (100-20 000 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. © 2021 American Physical Society.
