Abstract
The presence of additional hydrodynamic modes, associated with the fluctuations in incommensurate, or phason degrees of freedom, is a distinctive dynamical feature of quasicrystals. The phason dynamics can give rise to a novel form of atomic transport, which is expected to be much faster than the conventional vacancy-driven diffusion in crystals and amorphous solids. In this paper, a computer simulation is reported utilizing a realistic 3D model of an axial stacked dodecagonal quasicrystal, which is found to exhibit a high rate of phason flips as well as the related atomic diffusion. The tagged particle dynamics, explored through the simulated incoherent intermediate scattering function, Fs(Q, t), are found to display, in the α-relaxation time window, a pronounced stretching of relaxation times. This can be successfully approximated by the Kohlrausch function, revealing an anomalously small value of the stretching exponent, β = 0.47, which is analyzed in terms of modes involved.
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