Self-Diffusion in Random-Tiling Quasicrystals

Details Self-Diffusion in Random-Tiling Quasicrystals Self-Diffusion in Random-Tiling Quasicrystals

1994-08-18

arxiv.org/abs/cond-mat/9408048v2

Physics

Condensed Matter

11 pages + 2 figures, COMPRESSED postscript figures available by anonymous ftp to black_hole.physics.ubc.ca directory outgoing

Scientific paper

10.1103/PhysRevLett.73.2464

The first explicit realization of the conjecture that phason dynamics leads to self-diffusion in quasicrystals is presented for the icosahedral Ammann tilings. On short time scales, the transport is found to be subdiffusive with the exponent $\beta\approx0.57(1)$, while on long time scales it is consistent with normal diffusion that is up to an order of magnitude larger than in the typical room temperature vacancy-assisted self-diffusion. No simple finite-size scaling is found, suggesting anomalous corrections to normal diffusion, or existence of at least two independent length scales.

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