Abstract

Kerr rotation and ellipticity measurements in the 0.5–5 eV energy range and optical reflectivity data covering the photon energies 0.03–12 eV are presented for single crystals of CeSb, CeSb 0.75Te 0.25 and CeTe. The (single) Kerr rotation of CeSb is found to exceed 14° which is by far the largest value ever observed. The energy of the 4f 1 → 5d transition of CeSb is determined to be ∼ 0.4 eV.

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