铁电性
材料科学
格式化
电场
矫顽力
化学物理
电介质
凝聚态物理
极化(电化学)
极化密度
氢键
纳米技术
物理化学
磁场
分子
有机化学
光电子学
化学
物理
磁化
量子力学
催化作用
作者
P. S. Ghosh,Derick DeTellem,Junyu Ren,Sarath Witanachchi,Si‐Rui Ma,S. Lisenkov,I. Ponomareva
标识
DOI:10.1103/physrevlett.128.077601
摘要
Hybrid organic-inorganic perovskites is a class of materials with diverse chemically tunable properties and outstanding potential for multifunctionality. We use first-principles simulations to predict room temperature ferroelectricity in a representative of the formate family, [NH_{2}NH_{3}][Co(HCOO)_{3}]. The ferroelectricity arises as a "by-product" of structural transition driven by the stabilization of the hydrogen bond. As a consequence the coupling with the electric field is relatively weak giving origin to large intrinsic coercive fields and making material immune to the depolarizing fields known for its detrimental role in nanoscale ferroelectrics. Insensitivity to the electric field and the intrinsic dynamics of the order-disorder transition in such material leads to the supercoercivity defined as significant increase in the coercive field with frequency. Room temperature polarization measurements provide further support for the predictions.
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