β-NMR of 8Li+ in rutile TiO2

[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.

[发布机构] 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