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Effects of Interfacial Polarization on Voltage Tunability of Pb(Fe1/2Nb1/2)1-xTixO3 Single Crystals
Authors:LIU Kui  ZHANG Xin-Yi  XIAO Jing-Zhong
Institution:Surface Physics Laboratory (State Key Laboratory), Synchrotron Radiation Research Center, and Department of Physics of Fudan University, Shanghai 200433International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016
Abstract:The voltage tunability of Pb(Fe1/2Nb1/2)1-xTixO3 single crystals is investigated at a low electric field (<130 V/cm) in a low frequency range (<1 MHz). The results show that the capacitance is strongly suppressed by the applied dc biases for both the rhombohedral sample and the tetragonal sample. A negative voltage tunability is only detected in the tetragonal sample. The origin of the giant tunability and the negative tunability is discussed based on the multipolarization-mechanism model and the equivalent circuit model, respectively. It is ascribed to the interfacial polarization at the interface of electrode/sample.
Keywords:77  22  -d  77  84  Dy  77  84  Lf  77  90  +k
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