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Hyperfine interactions at nitrogen interstitial defects in diamond

Lookup NU author(s): Mohammed Atumi, Dr Jon Goss, Professor Patrick Briddon, Fadil Shrif, Dr Mark Rayson

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Abstract

Diamond has many extreme physical properties and it can be used in a wide range of applications. In particular it is a highly effective particle detection material, where radiation damage is an important consideration. The WAR9 and WAR10 are electron paramagnetic resonance centres seen in irradiated, nitrogen-containing diamond. These S = 1/2 defects have C-2v and C-1h symmetry, respectively, and the experimental spectra have been interpreted as arising from nitrogen split-interstitial centres. Based upon the experimental and theoretical understanding of interstitial nitrogen defect structures, the AIMPRO density functional code has been used to assess the assignments for the structures of WAR9 and WAR10. Although the calculated hyperfine interaction tensors are consistent with the measured values for WAR9, the thermal stability renders the assignment problematic. The model for the WAR10 centre yields principal directions of the hyperfine tensor at variance with observation. Alternative models for both centres are discussed in this paper, but no convincing structures have been found.


Publication metadata

Author(s): Atumi MK, Goss JP, Briddon PR, Shrif FE, Rayson MJ

Publication type: Article

Publication status: Published

Journal: Journal of Physics: Condensed Matter

Year: 2013

Volume: 25

Issue: 6

Print publication date: 13/02/2013

ISSN (print): 0953-8984

ISSN (electronic): 1361-648X

Publisher: Institute of Physics Publishing Ltd.

URL: http://dx.doi.org/10.1088/0953-8984/25/6/065802

DOI: 10.1088/0953-8984/25/6/065802


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