Title
Atomic (phason) hopping in perfect icosahedral quasicrystals Al70.3Pd21.4Mn8.3 by time-of-flight quasielastic neutron scattering
Author
Publication type
article
Publication
Lancaster, Pa ,
Subject
Physics
Source (journal)
Physical review : B : condensed matter and materials physics. - Lancaster, Pa, 1998 - 2015
Volume/pages
53() :6 , p. 3150-3160
ISSN
0163-1829
ISI
A1996TV64500046
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
We report neutron-scattering results on atomic hopping in quasicrystals (QC) in the system Al-Pd-Mn. Two distinct atomic jump times have been observed and studied as a function of temperature. The unusual temperature behavior reported previously for 3.9 Angstrom jumps in Al-Cu-Fe (and interpreted as evidence for assisted hopping) is also found here, such that it seems to be universal. We provide a full discussion of all previous quasi-elastic-scattering results in QC, and show that their most reasonable interpretation is in terms of atomic hopping (phason dynamics). The relation of these data to theoretical predictions of fast diffusion and depinning transitions in the phason dynamics is examined.
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