J. Dolinsek et al., ATOMIC MOTION IN QUASI-CRYSTALLINE AL70RE8.6PD21.4 - A 2-DIMENSIONAL EXCHANGE NMR-STUDY, Physical review letters, 81(17), 1998, pp. 3671-3674
Al-27 2D exchange NMR experiments on an icosahedral Al70Re8.6Pd21.4 qu
asicrystal have detected slow atomic motions in the sub-kHz range at t
emperatures between 0.16 and 130 K. The observed motion is limited in
space and can be associated with local phason fluctuations at very low
energies, involving quantum tunneling at very low temperatures. It ma
y thus be regarded as an atomic motion acting as a precursor to bulk s
elf-diffusion. [S0031-9007(98)07456-0].