Phonon-phason coupling in icosahedral quasicrystals

W. J. Zhu, C. L. Henley

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Pages (from-to)748-754
Number of pages7
JournalEurophysics Letters
Volume46
Issue number6
DOIs
StatePublished - Jun 15 1999
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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