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EFFECTS OF INTERFACIAL PSEUDO-SPIN COUPLING FLUCTUATIONS ON THE DIELECTRIC PROPERTIES OF FERROELECTRIC SUPERLATTICES

YIN-ZHONG WU

Jiangsu Laboratory of Advanced Functional Materials, Changshu Institute of Technology, Changshu 215500, China

Department of Physics, National Cheng Kung University, Tainan 701, Taiwan, ROC

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WEI-MIN ZHANG

Department of Physics, National Cheng Kung University, Tainan 701, Taiwan, ROC

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MING-RONG SHEN

Department of Physics, Suzhou (Soochow) University, Suzhou 215006, China

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, and

ZHEN-YA LI

Department of Physics, Suzhou (Soochow) University, Suzhou 215006, China

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https://doi.org/10.1142/S0217979205032036Cited by:0 (Source: Crossref)

Abstract

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 BaTiO₃/SrTiO₃ 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.

Keywords:

PACS: 77.22.Ch, 77.55.+f

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