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Discerning Phason Coherency In Quasicrystalline Systems

Published online by Cambridge University Press:  10 February 2011

G. G. Naumis
Affiliation:
Instituto de Física, Universidad Nacional Autónoma de México (UNAM), Apdo 20–364, 01000, D.F., Mexico.
Chumin Wang
Affiliation:
Instituto de Investigaciones en Materiales, UNAM, Apdo 70–360, 04510, D.F. , México.
R. A. Barrio
Affiliation:
Instituto de Física, Universidad Nacional Autónoma de México (UNAM), Apdo 20–364, 01000, D.F., Mexico.
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Abstract

Phason disorder is expected to modify the neutron and x-ray scattering spectra of quasicrystals. However, it is not clear yet if phasons are coherent modes in real space, or if they should be considered as local random defects. In this work, a comparative study of different sorts of phasons is performed, and their effects on the dynamical structure factor of Fibonacci chains are analyzed in detail. The results show that coherent and random phasons can be distinguished for high values of the momentum transfer. Finally, it is observed that a random phason produced in the quasicrystal's hyper-space leads to a coherent phason field in real quasicrystalline lattice.

Type
Research Article
Copyright
Copyright © Materials Research Society 1999

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References

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