Interaction of Muons with H2/H3-Centres in Diamond |
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Authors: | Machi I. Z. Connell S. H. Sellschop J. P. F. Bharuth-Ram K. |
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Affiliation: | (1) Physics Department, University of South Africa, P.O. Box 392, Unisa, 0003, South Africa;(2) Schonland Research Centre for Nuclear Sciences, University of the Witwatersrand, PO Wits, Johannesburg, 2050, South Africa;(3) Physics Department, University of Durban-Westville, Private Bag X54001, Durban, 4000, South Africa |
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Abstract: | We report on transverse field muon spin rotation measurements on a nitrogen-rich type Ia diamond, both before and after the conversion of some of the aggregated nitrogen centres to nitrogen-vacancy complexes known as H2/H3-centres. The prompt fractions f and the spin relaxation rates λ were determined for the diamagnetic (μd) and the paramagnetic (MuT) states in the temperature range 10–300 K. The production of the nitrogen-vacancy complexes had little effect on the parameters of the MuT state for which f and λ remained unchanged at approximately 30% and 4 μs−1, respectively. For the μd state, on the other hand, the formation of the H2/H3-centres resulted in an increase of the prompt fraction from 10(2)% to 20(3)%, and (for the first time) the spin relaxation rate showed a non-zero value of 0.020(3) μs−1. These results show evidence of strong μd interactions with the nitrogen-vacancy complexes in diamond, and suggest a more complex structure for this state than a bare μ+. This revised version was published online in September 2006 with corrections to the Cover Date. |
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Keywords: | muon H2/H3-centres diamond |
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