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Persistent URL http://purl.org/net/epubs/work/49882
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Record Id 49882
Title Muon dynamics in superprotonic conductors
Abstract In order to clarify the mechanism of high proton conductivity (sigmaH+) for superprotonic conductors, MHXO4, where M=Cs and Rb, X=S and Se, mu+SR experiments have been performed in the temperature range between 250 and 450 K using single crystal samples. Here, MHXO4 exhibits extraordinary high sigmaH+ at T above its structural phase transition ( for CsHSO4) from a low-T monoclinic phase (Phase II) to a high-T tetragonal phase (Phase I). Since the asymmetry of weak transverse field (wTF) spectrum does not reach its maximum at ambient T, muonium (Mu) state is found to exist in both CsHSO4 and CsHSeO4. The Mu fraction in wTF spectrum for CsHSO4 is still a finite value even in Phase I, while the Mu state disappears in Phase I of CsHSeO4. The longitudinal field mu+SR measurements for observing the Mu state and its dynamics in CsHSO4, show fast Mu diffusion and the conversion from Mu to diamagnetic mu+ in whole T range measured. Considering the fact that the sigmaH+ in Phase I of CsHSO4 is about 10 times larger than that of CsHSeO4, the Mu formation in Phase I implies the presence of the atomic hydrogen state and play a possible crucial role for the high sigmaH+ in Phase I of CsHSO4.
Organisation ISIS , ISIS-EMU , STFC
Keywords Materials , Physics , Proton diffusion , Muon spin rotation/relaxation spectroscopy , Superprotonic conductors
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Language English (EN)
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Journal Article Physica B 404, no. 5-7 (2009): 798-800. Is in proceedings of: 11th International Conference on Muon Spin Rotation, Relaxation and Resonance (MuSR2008), Tsukuba, Japan, 21-25 Jul 2008. doi:10.1016/j.physb.2008.11.170 2009