Spin-Coupling in Heavily Nitrogen-Doped 4H-SiC

D.V. Savchenko, A. Pöppl, E.N. Kalabukhova, S. Greulich-Weber, E. Rauls, W.G. Schmidt, U. Gerstmann, Materials Science Forum 615–617 (2009) 343–346.

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Abstract
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.
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Materials Science Forum
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615-617
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343-346
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Savchenko DV, Pöppl A, Kalabukhova EN, et al. Spin-Coupling in Heavily Nitrogen-Doped 4H-SiC. Materials Science Forum. 2009;615-617:343-346. doi:10.4028/www.scientific.net/msf.615-617.343
Savchenko, D. V., Pöppl, A., Kalabukhova, E. N., Greulich-Weber, S., Rauls, E., Schmidt, W. G., & Gerstmann, U. (2009). Spin-Coupling in Heavily Nitrogen-Doped 4H-SiC. Materials Science Forum, 615617, 343–346. https://doi.org/10.4028/www.scientific.net/msf.615-617.343
@article{Savchenko_Pöppl_Kalabukhova_Greulich-Weber_Rauls_Schmidt_Gerstmann_2009, title={Spin-Coupling in Heavily Nitrogen-Doped 4H-SiC}, volume={615–617}, DOI={10.4028/www.scientific.net/msf.615-617.343}, journal={Materials Science Forum}, publisher={Trans Tech Publications}, author={Savchenko, D.V. and Pöppl, Andreas and Kalabukhova, Ekaterina N. and Greulich-Weber, Siegmund and Rauls, Eva and Schmidt, Wolf Gero and Gerstmann, Uwe}, year={2009}, pages={343–346} }
Savchenko, D.V., Andreas Pöppl, Ekaterina N. Kalabukhova, Siegmund Greulich-Weber, Eva Rauls, Wolf Gero Schmidt, and Uwe Gerstmann. “Spin-Coupling in Heavily Nitrogen-Doped 4H-SiC.” Materials Science Forum 615–617 (2009): 343–46. https://doi.org/10.4028/www.scientific.net/msf.615-617.343.
D. V. Savchenko et al., “Spin-Coupling in Heavily Nitrogen-Doped 4H-SiC,” Materials Science Forum, vol. 615–617, pp. 343–346, 2009.
Savchenko, D. V., et al. “Spin-Coupling in Heavily Nitrogen-Doped 4H-SiC.” Materials Science Forum, vol. 615–617, Trans Tech Publications, 2009, pp. 343–46, doi:10.4028/www.scientific.net/msf.615-617.343.

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