Physics – Condensed Matter – Materials Science
Scientific paper
2004-01-12
Physics
Condensed Matter
Materials Science
14 pages, 5 figures, RevTex4
Scientific paper
10.1142/S0217979205032036
Using effective-field theory with correlations, we investigate the effects of interfacial pseudo-spin coupling fluctuations on the susceptibility and polarization of ferroelectric superlattices within the framework of transverse Ising model. It is found that the interfacial coupling fluctuations increase the susceptibility in the low temperature region. For a strong interfacial coupling, the phase transition temperature decreases with the strength of fluctuations of the interfacial coupling. The dependence of the susceptibility on the superlattice period of $BaTiO_{3}/SrTiO_{3}$ are plotted for different interfacial coupling fluctuations strength. At room temperature, when the interfacial coupling fluctuation increases, the peak position of the susceptibility will shift to a large superlattice period.
Li Zhen-Ya
Shen Ming-Rong
Wu Yin-Zhong
Zhang Wei-Min
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