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Diffusion of interstitial muonium, MuT, in a 13C diamond

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dc.contributor.author Gxawu D. en
dc.contributor.author MacHi I.Z. en
dc.contributor.author Connell S.H. en
dc.contributor.author Bharuth-Ram K. en
dc.contributor.author Sithole M.J. en
dc.contributor.author Cox S.F.J. en
dc.date.accessioned 2012-11-01T16:31:35Z
dc.date.available 2012-11-01T16:31:35Z
dc.date.issued 2005 en
dc.identifier.citation Diamond and Related Materials en
dc.identifier.citation 14 en
dc.identifier.citation 07-Mar en
dc.identifier.issn 9259635 en
dc.identifier.other 10.1016/j.diamond.2004.11.002 en
dc.identifier.uri http://hdl.handle.net/10500/7401
dc.description.abstract We report on the motional behavior of the tetrahedral interstitial muonium (MuT) the chemical analogue, and light isotope of neutral atomic hydrogen, in a 90% enriched 13C diamond. Muonium forms after implantation of positive muons into diamond. In the 13C diamond, the muon spin relaxes due to the motion of MuT against the background of randomly oriented spins of the host nuclei. Spin-lattice relaxation of the initially spin-polarized muons, in their capacity as nuclei of the Mu T atoms, was studied as a function of magnetic field and temperature in the ranges 20 mT-0.4 T and 10-400 K, respectively. The extracted hop rate is large, τc-1∼1011 Hz, indicating fast diffusion of MuT, as expected for such a light interstitial atom. Its approximately constant value over the entire measured temperature range suggests weakly scattered coherent tunneling rather than incoherent or phonon-assisted tunneling, consistent with the high Debye temperature of diamond and the shallow interstitial potential for neutral hydrogen or muonium. There are indications of increasing localization of the wave-packet, i.e., of an incipient change to incoherent tunneling, towards the higher temperatures. Thermal conversion of the mobile MuT state to the stable bond-centered muonium (MuBC) state prevents the diffusion of Mu T being explored beyond 400 K. © 2004 Elsevier B.V. All rights reserved. en
dc.language.iso en en
dc.subject Diamond; Diffusion; Hydrogen; Muonium Diffusion; Hydrogen; Isotopes; Magnetic fields; Polarization; Relaxation processes; Thermal effects; Debye temperature; Muonium; Spin relaxation; Spin-lattice; Diamonds en
dc.title Diffusion of interstitial muonium, MuT, in a 13C diamond en
dc.type Conference Paper en


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