Identification of cobalt on a lattice site in diamond
- Twitchen, DJ
- Baker, JM
- Newton, ME
- Johnston, K
DOIAbstract
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 (<30 K) 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 S = 1/2, monoclinic I symmetry and a hyperfine splitting from a nucleus with I = 7/2. Analysis of the measured hyperfine interaction in terms of 3d5 gives the unpaired electronic wave function on the cobalt atom, and correctly predicts the measured g matrix. The wide linewidth of the EPR absorption suggests a small hyperfine interaction arising from a nearby nitrogen atom. Based on this evidence, a...
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