Identification of cobalt on a lattice site in diamond
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 (<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 model for O4 is presented in terms of a CoN complex.
- Publication:
-
Physical Review B
- Pub Date:
- January 2000
- DOI:
- 10.1103/PhysRevB.61.9
- Bibcode:
- 2000PhRvB..61....9T
- Keywords:
-
- 61.72.Ji;
- 61.72.Bb;
- 76.30.Dx;
- 76.30.Mi;
- Point defects and defect clusters;
- Theories and models of crystal defects;
- Color centers and other defects