The Faraday rotation of EuS and the polar Kerr-rotation and-ellipticity spectra for lanthanide and actinide compounds with signals exceeding 3 deg are analyzed in terms of the off-diagonal conductivity and various optical parameters. It is shown that in EuO, USbo. aTeo. 2 and CeSb the large Kerr-rotation angles of ~ 7, 9 and 14 deg, respectively, are dominated by f ~ d interband transitions. On the other hand, the Kerr rotation of 6 deg in U3As4 and the Kerr ellipticity of 3.6 deg in TmSe are due to intraband transitions. Especially the latter compound is peculiar, because its maximum ellipticity results from an enhanced plasma edge splitting. For most materials microscopic models are presented which describe quantitatively the magneto-optical properties.
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