Paper Title:
Spin-Coupling in Heavily Nitrogen-Doped 4H-SiC
  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-forbid¬den lines, arising from Nc,k pairs and triads or resulting from hopping conductivity, only re¬cent¬ly 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-struc¬ture splitting too small to be observed in the EPR and ESE experiments. In this work, we pre¬sent 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.

  Info
Periodical
Materials Science Forum (Volumes 615-617)
Edited by
Amador Pérez-Tomás, Philippe Godignon, Miquel Vellvehí and Pierre Brosselard
Pages
343-346
DOI
10.4028/www.scientific.net/MSF.615-617.343
Citation
D.V. Savchenko, A. Pöppl, E. N. Kalabukhova, S. Greulich-Weber, E. Rauls, W. G. Schmidt, U. Gerstmann, "Spin-Coupling in Heavily Nitrogen-Doped 4H-SiC", Materials Science Forum, Vols. 615-617, pp. 343-346, 2009
Online since
March 2009
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