本征约瑟夫森结与超导金属膜界面性质研究及相关器件制备

项目名称： 本征约瑟夫森结与超导金属膜界面性质研究及相关器件制备

项目编号： No.61302004

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 魏彦锋

作者单位： 湖北文理学院

项目金额： 27万元

中文摘要： 探索稳定的高温超导SQUID等器件制备工艺是高温超导约瑟夫森器件研究亟待解决的核心问题。由于高温超导相干长度很短（小于1nm），应用传统方法如：晶界结、台阶结、邻近效应结等制备出的样品稳定性不足。本项目利用层状铜氧化物超导体内存在的本征约瑟夫森效应，制备出性质稳定的约瑟夫森结，结和结之间由超导电极相连成为高质量SQUID和阵列等器件。单个结的制备采用低温解理单晶，真空原位快速蒸发金属电极的方法；结和结之间的连接采用BiSrCaCuO(2212)/稳定金属/超导金属方案，通过建立邻近效应模型和实验验证相结合方法，实现器件内部超导通路。结合低温超导领域已有理论和经验，设计制备出具有最大磁场调制深度的SQUID和阵列。研究高温超导SQUID和阵列的低温物理特性，揭示d波超导电子配对条件下新颖的量子力学规律。因此，本项目的实施可以为相关研究奠定理论和技术基础。

中文关键词： 本征约瑟夫森效应；高温超导；邻近效应；d 波配对；四端法

英文摘要： Exploring stable high-temperature superconducting SQUID and array preparation process is the urgent need to solve the core problem of high temperature superconducting Josephson devices. For the coherence length of high temperatue superconductor is very short (less than 1nm), prepared samples, applying traditional methods such as: grain boundary junction, step-edge junction, proximity effect junction, are usually unstable. Based on the intrinsic Josephson effect of the layered copper oxide superconductor, provided by the stable nature of the inner crystal structure, the junction and the junction between the superconducting electrodes connected to become a high quality SQUID and array devices. Single junctions fabricated using low-temperature single-crystal cleavage, vacuum in situ rapid evaporation of the metal electrode; connection between the knot and the knot with BiSrCaCuO (2212) / stable metal / superconducting metals program, through the establishment of the proximity effect model and experimental validation of combination of methods to achieve the device internal superconducting circuit. Combined with low-temperature superconducting existing theory and experience in the field, the design prepared Qubit Squid has the largest magnetic field modulation depth and the maximum coupling strength. Study high-temp

英文关键词： Intrinsic Josephson effect；High temperature superconductivity；Proximity effect；d wave pairing；Four terminal method