phasonn.
/ˈfeɪzɒn/, U.S. /ˈfeɪˌzɑn/ Physics.
1. A formation of electrons localized within and stabilizing a region of a distinct phase (phase n.2 4) within a non-metallic material. disused.
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phason1970
1970 tr. M. A. Krivoglaz in Soviet Physics: Solid State 11 1802/2 It is natural to call such formations of electrons localized near phase II regions and maintaining the equilibrium of such regions, ‘phasons’, whether the formations are mobile or essentially immobile.
2. A quantum or quasiparticle associated with variation of the phase of movements of the lattice elements in a quasicrystalline lattice. Frequently attributive. Cf. phonon n. 1.
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the world > matter > physics > quantum theory > [noun] > quasiparticle > types of > associated with waves
phonon1932
magnon1941
phason1971
1971 A. W. Overhauser in Physical Rev. B. 3 3176/2 q→ is the wave vector of a phase-modulation phonon, or ‘phason’.
1985 Physical Rev. B. 32 5771/2 If the dynamical matrix of dimensions 6 × 6 is computed, there will be terms mixing the phonon and phason modes.
1987 Nature 10 Dec. 556/1 They attributed the distortions of the pattern to phason strains in the structure.
2004 Ferroelectrics 305 182 A pure infinite wave-length phason is a phonon with an eigenvector proportional to the derivative of the modulation function.
This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).
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n.1970