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
Title
Oder-disorder and displacive transitions in a quantum ising model
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
[isVersionOf]
[URI]http://www.ipap.jp/jpsj/index.html
Schools
大学院理工学研究科（理学）