Electron Spin Resonance Studies in SiC

Abstract

Electron spin resonance studies have been made on boron and nitrogen as impurities in $6H$ silicon carbide. It is concluded that both impurities substitute for carbon and that they occupy the three nonequivalent carbon sites with equal probability. Hyperfine structure is well resolved for both species. The pattern for boron occupying one site is unusual in that the hyperfine splitting vanishes when the applied field is about 50° from the hexagonal axis of the crystal. The nitrogen hyperfine structure is interpretable in terms of some $s$ character for the unpaired electron, while the boron hyperfine structure indicates predominantly $p$ character.