Optical and magneto-optical properties of Fe0.28TaS2

Abstract

Ellipsometry and polar magneto-optical Kerr effect measurements were performed on Fe0.28TaS2 in the photon energy region 0.6-5 eV. The complex dielectric tensor was calculated from the measured data. Strong anisotropy was found in the diagonal elements of the dielectric tensor. Strong absorption bands at 1.6 and 3.8 eV for light polarized perpendicular to the c-axis were attributed to transitions between Ta 5d bands. In the off-diagonal element of the dielectric tensor five transitions with diamagnetic line shapes were observed. These transitions are between Fe 3d and Ta 5d states. The large magneto-optical contribution results from the large exchange splitting of the Fe 3d states combined with the large spin-orbit splitting of Ta 5d states.