Determination of the nature of fluctuations using Li8 and Li9β-NMR and spin-lattice relaxation
AbstractWe report a comparison of the 1/T1 spin-lattice relaxation rates for Li9 and Li8 in Pt and SrTiO3, in order to differentiate between magnetic and electric quadrupolar relaxation mechanisms. In Pt, the ratio of the 1/T1 spin relaxation rates RPt was found to be 6.82(29), which is close to but less than the theoretical limit of ∼7.68 for pure magnetic relaxation. In SrTiO3 this ratio was found to be 2.7(3), which is close to but larger than the theoretical limit of ∼2.14 expected for pure electric quadrupolar relaxation. These results bring insight into the nature of the fluctuations in the local environment of implanted Li8 observed by β-NMR.