Proper Permittivity for Depolarization Field and Its Implication to Universal Instability of Insulating Ferroelectric: A Note
Proper Permittivity for Depolarization Field and Its Implication to Universal Instability of Insulating Ferroelectric: A Note
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去极化场的适当介电常数及其对绝缘铁电体普遍不稳定性的影响：注释
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Yukio Watanabe
中科院分区：
文献类型：
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作者：
Yukio Watanabe
由于退极化场E d的介电常数取决于自发极化P S的定义，因此文献中经常使用不适当的介电常数。因此，我们定义适当的组合的介电常数和PS的E d是符合实验条件。我们表明，在大多数情况下，E d的介电常数应该是统一的，特别是对于非理想的电容器结构，这是经常讨论的Mehta公式的基础上。这种选择的介电常数被证明是一致的实验线性介电常数响应于外部场。这个介电常数表明假设铁电体作为绝缘体的问题下E d：一个无应变的二维单畴铁电相与P S ε表面不能存在，无论铁电体的厚度，当至少一个表面是未屏蔽的。或者，实验和理论结果之间的协议在一个介电常数ε 1为E d s...
Because the permittivity for the depolarization field E d depends on the definition of the spontaneous polarization P S , improper permittivity is often used in the literature. Therefore, we define proper combinations of the permittivity and P S for E d that are consistent with experimental conditions. We show that the permittivity for E d should be unity in most cases , especially for nonideal capacitor structures, which are often discussed on the basis of the Mehta formula. This choice of permittivity is shown to be consistent with the experimental linear permittivity in response to the external field. This permittivity indicates the problem with assuming a ferroelectric as an insulator under E d : A strain-free two-dimensional single-domain ferroelectric phase with a P S ⊥ surface cannot exist regardless of the thickness of the ferroelectric, when at least one of the surfaces is unscreened. Alternatively, the agreement between experimental and theoretical results obtained at a permittivity ≫1 for E d s...
影响因子：
8.6
作者：
N. Pertsev;H. Kohlstedt
通讯作者：
N. Pertsev;H. Kohlstedt