The 4T1 and 4T2 crystal-field transitions of Cr3+ have been observed in the absorption spectrum of CdIn2S4(Cr). From the similarity between the temperature dependence of the 4T2 band and the reported blue shift of the absorption edge of CdCr2S4 it is concluded that in CdCr2S4 this edge is caused by the 4T2 absorption band of the Cr3+ ions. The polar magneto-optic Kerr effect between 560 and 700 nm and the Faraday rotation between 800 and 8000 nm are reported for CdCr2S4. The Kerr effect spectrum indicates that the intrinsic band edge of CdCr2S4 is at 1.91 eV at 60°K and shifts to lower energies with decreasing temperature.
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IBM Journal of Research and Development
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06 April 2010
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