Abstract
The magneto-optical polar Kerr rotation and ellipticity have been measured for the first time from 0.6 to 4.6 eV on cleaved PrSb single crystals. A magnetic moment of 0.9 μ B per formula unit was induced in this singlet-ground state system by the application of a field of 100 kOe at a temperature of 15 K. In addition the near-normal incidence reflectivity has been determined from 30 meV to 12 eV and the various optical functions have been computed by means of the Kramers-Kronig relation. Then, from the magneto-optical Kerr spectra and the optical functions, the off-digital conductivity has been calculated. A comparison with data obtained previously for CeSb shows a similar optical but a very different magneto-optical behavior. The f→d transition energy of 0.4 eV in CeSb is corroborated. For PrSb a tentative assignment places this transition at 1.4 eV.
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