Superhyperfine interactions of the nitrogen donors in 4H SiC studied by pulsed ENDOR and TRIPLE ENDOR spectroscopy

摘要

The nitrogen donors residing at quasi-cubic lattice site (Nk) in 4H SiC were investigated by field sweep electron spin echo (FS ESE), pulsed electron nuclear double resonance (ENDOR) and pulsed General TRIPLE ENDOR spectroscopy. The ~(29)Si and ~(13)C superhyperfine lines observed in the FS ESE and ENDOR spectra of N_k in n-type 6H SiC were assigned by pulsed General TRIPLE resonance spectroscopy to the specific carbon (C) and silicon (Si) atoms located in the nearest environment of N_k in 4H SiC. The superhyperfine interaction constants and their relative signs for N_k with ~(29)Si and ~(13)C nuclei located in the nearest-neighbor shells are found from the General TRIPLE ENDOR spectra to be positive for C atoms and negative for Si atoms.