D'Haenens-Johansson, Ulrika F. S., Edmonds, A. M., Newton, M. E., Goss, J. P., Briddon, P. R., Baker, J. M., Martineau, P. M., Khan, R. U. A., Twitchen, D. J. and Williams, S. D.. (2010) EPR of a defect in CVD diamond involving both silicon and hydrogen that shows preferential alignment. Physical Review B (Condensed Matter and Materials Physics), Vol.82 (No.15). Article no. 155205. ISSN 1098-0121

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Abstract

A defect involving both silicon and hydrogen has been characterized using multifrequency electron paramagnetic resonance. The defect, denoted WAR3, was observed in a single-crystal chemical-vapor deposition diamond, which was homoepitaxially grown on a {110}-oriented substrate and doped with isotopically enriched silicon (90% Si-29). The obtained data are explained by a silicon divacancy structure which is decorated by a hydrogen atom and is in the neutral charge state, (Si-V2:H)(0) (S=1/2). The experimentally derived Si-29 and H-1 hyperfine parameters are in agreement with values calculated using the spin-density-functional technique, ruling out a nonplanar structure. Defects are usually randomly oriented such that there is an equal probability for the symmetry axis of the defect to lie along each of the crystallographically equivalent directions. However, the WAR3 defect shows preferential alignment with respect to the {110} growth plane of the sample. Approximately four times as many WAR3 centers were aligned with their mirror planes lying perpendicular to the growth plane, compared to a statistical distribution. This indicates that the majority of WAR3 defects grew in as units rather than by the diffusion and aggregation of constituents. Analysis of the increase in the WAR3 concentration and the decrease in preferential alignment upon annealing the sample at 1400 degrees C shows that WAR3 can also be created post growth.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Physical Review B (Condensed Matter and Materials Physics)
Publisher:	American Physical Society
ISSN:	1098-0121
Date:	15 October 2010
Volume:	Vol.82
Number:	No.15
Number of Pages:	10
Page Range:	Article no. 155205
Identification Number:	10.1103/PhysRevB.82.155205
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC), Science City Research Alliance (SCRA) Advanced Materials, European Regional Development Fund (ERDF)
URI:	http://wrap.warwick.ac.uk/id/eprint/4962

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