Thermodynamic driving force of transient negative capacitance of ferroelectric capacitors

Yuanyuan Zhang, Xiaoqing Sun, Junshuai Chai, Hao Xu, Xueli Ma, J. Xiang, Kai Han, Xiaolei Wang, Wenwu Wang
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引用次数: 1

Abstract

This paper investigates the thermodynamic driving force of transient negative capacitance (NC) in the series circuit of the resistor and ferroelectric capacitor (R-FEC). We find that the widely used Landau-Khalatnikov (L-K) theory, that is, the minimum of the Gibbs free energy, is inapplicable to explain the transient NC. The thermodynamic driving force of the transient NC phenomenon is the minimum of the difference between the elastic Gibbs free energy and the electric polarization work. The appearance of the transient NC phenomenon is not due to the widely accepted view that the ferroelectric polarization goes through the negative curvature region of elastic Gibbs free energy landscape (Ga). Instead, the transient NC phenomenon appears when the energy barrier of Ga disappears. The transient NC is dependent on both the intrinsic ferroelectric material parameters and extrinsic factors in the R-FEC circuit.
铁电电容器瞬态负电容的热力学驱动力
本文研究了电阻器与铁电电容器串联电路中瞬态负电容(NC)的热力学驱动力。我们发现广泛使用的Landau-Khalatnikov (L-K)理论,即Gibbs自由能的最小值,并不适用于瞬态NC的解释。瞬态数控现象的热力学驱动力是弹性吉布斯自由能与电极化功之差的最小值。瞬态NC现象的出现并不是因为人们普遍认为铁电极化经过弹性吉布斯自由能区(Ga)的负曲率区。相反,当Ga的能垒消失时,会出现瞬态NC现象。在R-FEC电路中,瞬态NC既取决于铁电材料的固有参数,也取决于外在因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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