Abstract
We calculate the linear magneto-optical Kerr rotation for CeSb in the near-infrared spectral range. Using an exact formula for large Kerr rotation angles and a simplified electronic structure of CeSb we find at h ̷ ω = 0.46 eV a Kerr rotation of 90° which then for decreasing ω jumps to −90° as recently observed. We identify the general origin of possible 180° polarization rotations as resulting from mainly nonmagnetic optical properties, in particular from the ratio of the dominant interband resonance frequency to the plasma frequency. The dependence of the Kerr rotation on moments and magnetization is discussed.
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