Phonon-phason coupling in icosahedral quasicrystals

Details Phonon-phason coupling in icosahedral quasicrystals Phonon-phason coupling in icosahedral quasicrystals

1998-12-09

arxiv.org/abs/cond-mat/9812139v1

Physics

Condensed Matter

Materials Science

7 pages, LaTeX, uses Europhys Lett macros (included)

Scientific paper

10.1209/epl/i1999-00328-9

From relaxation simulations of decoration-based quasicrystal structure models using microscopically based interatomic pair potentials, we have calculated the (usually neglected) phonon-phason coupling constant. Its sign is opposite for the two alloys studied, i-AlMn and i-(Al,Cu)Li; a dimensionless measure of its magnitude relative to the phonon and phason elastic constants is of order 1/10, suggesting its effects are small but detectable. We also give a criterion for when phonon-phason effects are noticeable in diffuse tails of Bragg peaks.

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