【作者】 谢中； 赵立华； 王祝盈； 陈小华； 黄桂芳； 罗恩洲； 许建斌； I.H.Wilson； 赵柏儒；

【Author】 XIE Zhong;ZHAO Li-hua;WANG Zhu-ying;CHEN Xiao-hua;HUANG Gui-fang;LUO En-zhou;XU Jian-bin;WILSON I. H~3, ZHAO Bai-ru Material Science and Engineering College Applied Physics Department,Hunan University, Changsha,410082,China Electronic Engineering Department and Materials Science and Technology Research Center The Chinese University of Hong Kong, N. T., Hong Kong National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Science, Beijing, 100082, China

【机构】 湖南大学材料科学与工程学院； 湖南大学应用物理系； 香港中文大学电子工程系材料科学与技术研究中心； 中国科学院物理研究所国家超导重点实验室；

【摘要】 运用一台经改进的原子力显微镜对PZT/YBCO异质结的微区漏电流和铁电性的关系进行了研究.样品形貌和漏电流的不均匀性与样品形貌及反映样品铁电性的压电响应被同时成像,并在纳米尺度上进行了研究。结果表明,漏电路径首先出现在晶界的薄弱处,随电场的增加而发展到整个晶粒。微观漏电流可由空间电荷限制电流模型加以描述。更多还原

【Abstract】 In this paper we present an investigation on probing leakage current and ferroelectricity of Pb(Zr₅₃Ti₄₇) O₃/YBa₂Cu₃O_x heterostructure using a modified atomic force microscopy. Inhomogeneities of leakage current andferroelectric properties were concurrently mapped and quantitatively studied on a nanometer scale. It shows thatmicroscopically the leakage current takes place from grain boundary and developed to the whole grain as the fieldstrength increased to a higher value. The leakage current can be described by a model based on space-charge-limitedcurrent.更多还原