Найдено научных статей и публикаций: 1, для научной тематики: Nitrogen donor
1.
D.V. Savchenko, A. Pöppl, E.N. Kalabukhova, S. Greulich-Weber, E. Rauls, W.G. Schmidt, U. Gerstmann
- Mat. Sci. Forum , 2009
EPR and ESE in nitrogen doped 4H- and 6H-SiC show besides the well known triplet
lines of 14N on quasi-cubic (Nc,k) and hexagonal (Nc,h) sites additional lines (Nx) of comparatively
low intensity providing half the hf splitting of Nc,k. Frequently re-interpreted as spin-forbidden
lines, arising f...
EPR and ESE in nitrogen doped 4H- and 6H-SiC show besides the well known triplet
lines of 14N on quasi-cubic (Nc,k) and hexagonal (Nc,h) sites additional lines (Nx) of comparatively
low intensity providing half the hf splitting of Nc,k. Frequently re-interpreted as spin-forbidden
lines, arising from Nc,k pairs and triads or resulting from hopping conductivity, only recently the
theoretical calculation of the corresponding g-tensors lead to a tentative model of distant NC donor
pairs on inequivalent lattice sites which are coupled to S = 1 assuming a fine-structure splitting too
small to be observed in the EPR and ESE experiments. In this work, we present ESE nutation
measurements confirming S = 1 for the Nx center. Analysing the nutation frequencies in
comparison with that of the Nc,k (S = 1/2) spectrum as well as the line width of ESE and EPR
spectra we obtain a rough estimate between 5×104 cm-1 and 50×104 cm-1 for the fine-structure
splitting demonstrating efficient spin-coupling between nitrogen donors in 4H-SiC.