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Gapless phasons and transverse sound-wave asymmetries in K2SeO4

Physical Review B, ISSN: 0163-1829, Vol: 36, Issue: 10, Page: 5377-5382
1987
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  • Citations
    9
    • Citation Indexes
      9

Article Description

Based on an inelastic neutron scattering experiment, it has recently been suggested that phasons in the incommensurate phase of K2SeO4 possess a gap of approximately 50 GHz [M. Quilichini and R. Currat, Solid State Commun. 48, 1011 (1983)]. We have found that these data may also be explained using a coupled phason sound-wave theory, for which the phasons are gapless. We then use the coupled excitation theory to predict certain velocity and attenuation asymmetries for transverse sound waves under interchange of their propagation and polarization directions. Lastly, we find that, in the long-wavelength limit, the attenuation asymmetry present for a system with gapless phasons is absent for a system possessing a phason gap. © 1987 The American Physical Society.

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