Abstract
We report the finding of an electron-paramagnetic-resonance (EPR) center, labeled O4, which contains cobalt on a site in the diamond lattice. O4 is observed at low temperatures in high temperature and pressure synthetic diamonds grown with a cobalt containing metal-solvent catalyst after a high-temperature anneal at 1800 °C. The center has monoclinic I symmetry and a hyperfine splitting from a nucleus with Analysis of the measured hyperfine interaction in terms of gives the unpaired electronic wave function on the cobalt atom, and correctly predicts the measured matrix. The wide linewidth of the EPR absorption suggests a small hyperfine interaction arising from a nearby nitrogen atom. Based on this evidence, a model for O4 is presented in terms of a CoN complex.
- Received 6 July 1999
DOI:https://doi.org/10.1103/PhysRevB.61.9
©2000 American Physical Society