Volume 73, Number 4, February 2006
|Page(s)||601 - 606|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||11 January 2006|
Phase diagrams of the transverse Ising model with a four-spin interaction
School of Physical Electronics, University of Electronic Science and Technology of China - Chengdu 610054, PRC
2 Department of Physics, National University of Singapore Kent Ridge, Singapore 117542, Republic of Singapore
Corresponding author: firstname.lastname@example.org
Accepted: 22 December 2005
This paper investigates the phase diagrams of a ferroelectric thin film described by the transverse Ising model with a four-spin interaction. Within the framework of the higher decoupling approximation, the phase diagrams for the first-order and second-order transitions in a ferroelectric thin film are obtained, respectively, while increasing and decreasing temperature. The effects of various parameters and film thickness on the phase diagrams are shown, and the comparison between the higher decoupling approximation and the usual mean-field approximation is illustrated.
PACS: 77.80.Bh – Phase transitions and Curie point / 75.10.Hk – Classical spin models / 77.55.+f – Dielectric thin films
© EDP Sciences, 2006
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