Temperature dependent infrared spectroscopy of PrAlSi

PrAlSi represents a particular example of Weyl semimetal with ferromagnetic ground state, providing a platform for studying the effects of coupling between magnetism and Dirac fermions. Here, we present optical conductivity studies on single crystals of PrAlSi, determined from Kramers-Kronig transformation of reflectance measurements, in the range 80 cm^-1 to 50,000 cm^-1, at temperatures between 300 K and 5 K. We show detailed optical measurements at low temperature, from 5 K to 20 K, and focus our discussion on the evolution of spectral weight through the ferromagnetic transition, and on the potential effect of magnetic ordering on the linear (Dirac) electronic bands.