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Oder-disorder and displacive transitions in a quantum ising model

Journal of the Physical Society of Japan Volume 77 Issue 8 Page 084709-1-084709-6
published_at 2008
2008010238.pdf
[fulltext] 230 KB
Title
Oder-disorder and displacive transitions in a quantum ising model
Creators Mashiyama Hiroyuki
Creators Mkam Tchouobiap Serges Eric
Creators Ashida Masami
Creator Keywords
order-disorder displacive ferroelectric transition anharmonic-oscillator model quantum Ising model susceptibility specific heat Debye-Waller factor
A ferrodistortive phase transition is analyzed for a quantum particles in a simple quartic potential. The interactions are taken into account by the mean-field approximation. A quantum thermodynamic treatment gives analytic expressions for the static susceptibility, the specific heat and the soft mode frequency. The Rhodes-Wohlfarth ratio is a measure whether the system is order-disorder or displacive, however, the border is fuzzy depending on the interaction strength. The quantum effect is discussed when the transition takes place at low temperature. Whether the atomic density is a single or multiple peak distributions seems to be a definite criterion for the character of the structural phase transition.
Languages eng
Resource Type journal article
Publishers The Physical Society of Japan
Date Issued 2008
Rights
Copyright c (2008)The Physical Society of Japan()
File Version Author’s Original
Access Rights open access
Relations
[ISSN]0031-9015
[NCID]AA00704814
info:doi/10.1143/JPSJ.77.084709
[isVersionOf] [URI]http://www.ipap.jp/jpsj/index.html
Schools 大学院理工学研究科(理学)