Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2006-06-14
Physics
Condensed Matter
Disordered Systems and Neural Networks
36 pages, 0 figures, discussion about vacancies, fluctuating Fourier components, and difference between static and dynamical s
Scientific paper
10.1140/epjb/e2006-00429-9
It has recently been claimed that the dynamics of long-wavelength phason fluctuations has been observed in i-AlPdMn quasicrystals. We will show that the data reported call for a more detailed development of the elasticity theory of Jaric and Nelsson in order to determine the nature of small phonon-like atomic displacements with a symmetry that follows the phason elastic constants. We also show that a simple model with a single diffusing tile is sufficient to produce a signal that (1) is situated at a "satellite position'' at a distance q from each Bragg peak, that (2) has an intensity that scales with the intensity of the corresponding Bragg peak, (3) falls off as 1/q-squared and (4) has a time decay constant that is proportional to 1/(D q-squared). It is thus superfluous to call for a picture of "phason waves'' in order to explain such data, especially as such "waves'' violate many physical principles.
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