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Phenomenological Description of the Acoustic Phonon Branch of K_2SeO_4

Ferroelectrics Volume 302 Page 147-150
published_at 2004
2007020118.pdf
[fulltext] 52.2 KB
Title
Phenomenological Description of the Acoustic Phonon Branch of K_2SeO_4
Creators Mashiyama Hiroyuki
Creators Mashiyama H.
Creator Keywords
Phenomenological approach acoustic branch K_2SeO_4
A phenomenological approach is used in investigating dispersion of the acoustic phonon branch of K_2SeO_4 in the extended zone scheme. The dispersion is expressed through coefficients of a simple thermodynamic potential. According to symmetry of the crystal (D_2h = mmm) the Lifshitz-type invariant exists in the potential. This invariant is responsible for the linear and dynamical interaction of the acoustic and optical branches. The soft optical branch lowering with decreasing temperature forces to lower the acoustic branch which becomes zero at some value of the wave vector.
Languages eng
Resource Type journal article
Publishers Taylor and Francis
Date Issued 2004
File Version Author’s Original
Access Rights open access
Relations
[ISSN]0015-0193
[NCID]AA00644949
https://doi.org/10.1080/00150190490453351
[isVersionOf] [URI]http://www.tandf.co.uk/journals/titles/00150193.asp
Schools 大学院理工学研究科(理学)