INTERBAND OPTICAL-PROPERTIES OF NI3AL

We present calculations of interband optical conductivity of the compo und Ni3Al using the linear-muffin-tin-orbital method. Calculations are performed using constant matrix elements and calculated matrix elemen ts. We find that matrix elements-play a significant role in influencin g the magnitude of optical conductivity sigma(omega) and the position of peaks. Since Ni3Al is weakly ferromagnetic (magnetic moment equal t o 0.31 mu(B) per unit cell), we have also calculated sigma(omega) usin g the ferromagnetic band structure but without spin-orbit coupling. A comparison of our results with experimental data is presented.