Low-temperature spin-lattice relaxation of⁸Li in the glass Li₂O·2SiO₂

authored by

P. Heitjans, B. Bader, H. J. Stöckmann, K. Dörr, G. Kiese, H. Ackermann, P. Freiländer, W. Müller-Warmuth, K. Meise-Gresch

Abstract

Nuclear spin-lattice relaxation in Li₂0·2Si0₂ glass below 200 K has been studied using the asymmetric Β-decay radiation of polarized⁸Li (T_1/2=0.Bs) nuclei produced by capture of polarized neutrons. Transients of the⁸Li polarization follow an exp(-√E/T₁) law. The dependence of the spin-lattice relaxation rate ⊥_-1¹ on temperature T and magnetic field B can roughly be described by T_-1¹∼T/B. The interpretation is based on the assumption that for⁸Li, contrary to⁷Li in the same glass, spin-diffusion is absent and that each probe nucleus is coupled by quadrupolar interaction to an individual distribution of nearby centres typical of glasses. The fluctuation of these centres causing relaxation may be induced by either a multi-phonon or a thermally activated motional process.

External Organisation(s)

Philipps-Universität Marburg
Institut Laue-Langevin
University of Münster

Type

Article

Journal

Hyperfine Interactions

Volume

16

Pages

597-600

No. of pages

4

ISSN

0304-3834

Publication date

12.1983

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics, Nuclear and High Energy Physics, Condensed Matter Physics, Physical and Theoretical Chemistry

Electronic version(s)

https://doi.org/10.1007/BF02147324 (Access: Unknown)