Abstract
Abstract The 3d transition metal ions (TMI) substituting for the cations in the tetrahedrally coordinated zincblende II–VI semiconductors display a localized mode above the rest-strahlen when introduced in dilute concentrations. The local mode observed in the infrared exhibits a characteristic dependence on the isotopic mass of the TMI. In the wurtzite II–VIs, the local mode undergoes a splitting into two components, one polarized along the optic axis and the other normal to it. The local mode frequency shows a striking non-monotonic dependence on the number of 3d electrons of the TMI.
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