Identification of the neutral carbon 〈100〉-split interstitial in diamond

D. C. Hunt, D. J. Twitchen, M. E. Newton, J. M. Baker, T. R. Anthony, W. F. Banholzer, and S. S. Vagarali
Phys. Rev. B 61, 3863 – Published 1 February 2000
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Abstract

A systematic study has been made of some of the properties of R2, the most dominant paramagnetic defect produced in type-IIa diamond by electron irradiation. R2 has been produced in high-purity synthetic diamonds, which have been irradiated with 2 MeV electrons in a specially developed dewar, allowing irradiation down to a measured sample temperature of 100 K, at doses of 2×1017 to 4×1018 electrons cm2. The production rate of vacancies [1.53(10)cm1] was the same for irradiation at 100 K as at 350 K, but the production rate of the R2 electron-paramagnetic-resonance (EPR) center is 1.1(1)cm1 at 100 K and only 0.10(5)cm1 at 350 K. Measurements have been made of the angular variation of the EPR linewidth, 13C hyperfine structure of samples grown with enriched isotopic abundance of 13C, and of the EPR of samples annealed under uniaxial stress (for which a special equipment was developed). A combination of these data with the previously measured data has shown that R2 is the neutral 100-split self-interstitial. This is an identification of an isolated stable self-interstitial in a group IV material. This shows that the self-interstitial is not mobile in type-IIa diamond under normal conditions (i.e., without the irradiation) until the annealing temperature of 700 K.

  • Received 6 May 1999

DOI:https://doi.org/10.1103/PhysRevB.61.3863

©2000 American Physical Society

Authors & Affiliations

D. C. Hunt, D. J. Twitchen, M. E. Newton*, and J. M. Baker

  • Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom

T. R. Anthony

  • General Electric Company, Corporate Research and Development, Building K1, Room IC30, Schenectady, New York 12301

W. F. Banholzer

  • General Electric Lighting, 1975 Noble Road, Nela Park, Cleveland, Ohio 44112-6300

S. S. Vagarali

  • GE Superabrasives, 6325 Huntley Road, Worthington, Ohio 43085

  • *Author to whom correspondence should be addressed. Present address: King’s College, London, Strand, London WC2R 2LS, U.K.

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Vol. 61, Iss. 6 — 1 February 2000

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