EPR and theoretical studies of positively charged carbon vacancy in 4H-SiC

T. Umeda, J. Isoya, N. Morishita, T. Ohshima, T. Kamiya, A. Gali, P. Deák, N. T. Son, E. Janzén

Research output: Contribution to journalArticle

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Abstract

The carbon vacancy is a dominant defect in 4H-SiC, and the "E15" electron-paramagnetic-resonance (EPR) spectrum originates from positively charged carbon vacancies (VC +) at quasicubic sites. The observed state for EI5, however, has been attributed to a motional-averaged state with the C3v symmetry, and its true atomic structure has not been revealed so far. We here report low temperature (1h-symmetric structure due to Jahn-Teller distortion. We also performed ab inito calculations of the hyperfine tensors for EI5, and obtained a good agreement between experiment and theory in not only their principal values but also their principal axis directions. A good agreement was also demonstrated for the EI6 center (hexagonal-site VC +) in this paper. The transition from EI5(C1h) to EI5(C3v) was found to be thermally activated and its activation energy was measured as 0.014 eV.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number23
DOIs
Publication statusPublished - Dec 2004

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Vacancies
Paramagnetic resonance
electron paramagnetic resonance
Carbon
Jahn-Teller effect
carbon
atomic structure
Tensors
Activation energy
tensors
activation energy
Defects
defects
symmetry
Experiments
Temperature
Direction compound

ASJC Scopus subject areas

  • Condensed Matter Physics

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EPR and theoretical studies of positively charged carbon vacancy in 4H-SiC. / Umeda, T.; Isoya, J.; Morishita, N.; Ohshima, T.; Kamiya, T.; Gali, A.; Deák, P.; Son, N. T.; Janzén, E.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 70, No. 23, 12.2004, p. 1-6.

Research output: Contribution to journalArticle

Umeda, T, Isoya, J, Morishita, N, Ohshima, T, Kamiya, T, Gali, A, Deák, P, Son, NT & Janzén, E 2004, 'EPR and theoretical studies of positively charged carbon vacancy in 4H-SiC', Physical Review B - Condensed Matter and Materials Physics, vol. 70, no. 23, pp. 1-6. https://doi.org/10.1103/PhysRevB.70.235212
Umeda, T. ; Isoya, J. ; Morishita, N. ; Ohshima, T. ; Kamiya, T. ; Gali, A. ; Deák, P. ; Son, N. T. ; Janzén, E. / EPR and theoretical studies of positively charged carbon vacancy in 4H-SiC. In: Physical Review B - Condensed Matter and Materials Physics. 2004 ; Vol. 70, No. 23. pp. 1-6.
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AU - Gali, A.

AU - Deák, P.

AU - Son, N. T.

AU - Janzén, E.

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