β-NMR of 8Li+ in rutile TiO2

13th International Conference on Muon Spin Rotation, Relaxation and Resonance

McFadden, R.M.L.^1 ; Cortie, D.L.^1,2,3 ; Arseneau, D.J.^4 ; Buck, T.J.^2 ; Chen, C.-C.^5 ; Dehn, M.H.^6 ; Dunsiger, S.R.^6 ; Kiefl, R.F.^2 ; Levy, C.D.P.^4 ; Li, C.^7 ; Morris, G.D.^4 ; Pearson, M.R.^4 ; Samuelis, D.^5 ; Xiao, J.^1 ; Maier, J.^5 ; Macfarlane, W.A.^1

Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver

BC

V6T 1Z1, Canada^1

Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver

BC

V6T 1Z1, Canada^2

Quantum Matter Institute, University of British Columbia, Vancouver

BC

V6T 1Z4, Canada^3

TRIUMF, 4004 Wesbrook Mall, Vancouver

BC

V6T 2A3, Canada^4

Max-Planck-Institut für Festkörperforschung, Stuttgart

D-70569, Germany^5

Physik-Department, Technische Universität München, James-Franck-Straße 1, Garching bei München

85748, Germany^6

Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai

200050, China^7

关键词: Applied field;    Fast relaxation;    Larmor frequencies;    Line broadening;    NMR measurements;    Quadrupole splits;    Quantum transitions;    Wide band gap insulator;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/551/1/012032/pdf
DOI  :  10.1088/1742-6596/551/1/012032

来源: IOP

【 摘 要 】

We report preliminary low-energy β-NMR measurements of8Li+implanted in single crystal rutile TiO2 at an applied field of 6.55 T and 300 K. We observe a broad 12 kHz wide quadrupole split resonance with unresolved features and a sharp component at the Larmor frequency. The line broadening may be caused by overlapping multi-quantum transitions or motion of8Li+on the scale of its lifetime (1.21 s). We also find spin-lattice relaxation that is relatively fast compared to other wide band gap insulators. The origin of this fast relaxation is also likely quadrupolar and may be due to anisotropic8Li+diffusion.