Abstract
Optically detected magnetic resonance (ODMR) experiments on epitaxial nitrogen-doped ZnO show spectra due to (i) a shallow donor with the full wurtzite symmetry, (ii) a previously unobserved spin- center of axial symmetry whose principal axis is tilted slightly away from the crystal axis, and (iii) a spin–1 triplet state of orthorhombic symmetry. The spin- center has a tensor that is of a different form from that of previously reported ODMR spectra for ZnO and is consistent with a model that contains a zinc interstitial, possibly in association with a nitrogen atom. The values for the triplet state are the average of those for a shallow donor and the spin- center, and the spectrum is thus assigned to a pair of such centers strongly coupled by a spin-exchange interaction.
- Received 16 April 2004
DOI:https://doi.org/10.1103/PhysRevB.70.115206
©2004 American Physical Society