Identification of the carbon antisite in SiC: EPR of $^{13}$C enriched crystals
Pavel G. Baranov, Ivan V. Ilyin, Alexandra A. Soltamova, and Eugene N. Mokhov

An EPR spectrum with axial symmetry along \emph{c} axis, spin \emph{S} = 1/2 and strong hyperfine interaction with one carbon atom has been observed in neutron- irradiated and annealed 6\emph{H}-SiC, $^{13}$C isotope enriched. The $^{13}$C concentration was defined from hyperfine structure for the negatively charged silicon vacancy. The spectrum is identified as arising from an isolated carbon atom presumably in Si position C$\tt_{Si}$ - carbon antisite. The unpaired spin is up to 43\% localized in one pure $p$ orbital that is directed along the $c$ axis and 10\% localized in three $sp^2$ hybrid orbitals and this means that the C atom is relaxed away from Si position.

© 2008 The American Physical Society.