Abstract
Magnetic resonance studies of native defects in Zinc germanium diphosphide (ZnGeP 2) and their energy level positions in the band gap are reviewed and first results on defects in ZnSiP 2 are presented. The contribution of the dominant native defects to the optical absorption of ZnGeP 2 crystals is revealed by photo-EPR investigations in combination with the first ODMR experiments. The EPR results published for Mn and Fe in the II–IV–V 2 chalcopyrites are summarized. The observation of some new Mn centers and the first experimental detection of antiferromagnetic Mn–Mn coupled pairs in ZnGeP 2 are presented. In addition, new results concerning Mn-induced local changes of the free parameter x f of the chalcopyrite structure at the impurity site are discussed.
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