Muon/Muonium in an Isotopically Pure 13C Diamond |
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| Authors: | Machi I Z Connell S H Sellschop J P F Bharuth-Ram K |
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| Institution: | (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: | A preliminary study of the diamagnetic (μd) and the paramagnetic (Mu
T
) states in a synthetic 13C diamond has been performed using the Transverse Field Muon Spin Rotation method. This system could be used to verify the
quantum diffusion behaviour observed before, however, with a more reliable extraction of the hopping rate. The results were
obtained in an applied magnetic field of 7.5 mT and at sample temperatures of 10 K, 100 K and 200 K. The prompt fraction,
f, of the μd state remains constant at 22(5)% in the range 10–200 K; that of the Mu
T
state increases from 53(10)% at 10 K to 78(10)% at 200 K. The fractions of the two states add to 100% at 200 K, suggesting
non-population of the bond-centred state, MuBC, which is often observed in other diamond samples. The μd state has a spin relaxation rate of 0.20(5) μs−1, in contrast to the zero value obtained in type II diamond samples. This indicates appreciable interaction of the μd state with the 13C atoms. The Mu
T
state has a large spin relaxation rate ranging from 3.0(5) μs−1 at 10 K to 7.0(5) μs−1 at 200 K, consistent with values obtained in diamond samples with defects. This work is part of ongoing studies of muon/muonium-defect
interactions in diamonds.
This revised version was published online in September 2006 with corrections to the Cover Date. |
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| Keywords: | muon muonium 13C diamond |
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