大尺寸YBa_2Cu_3O_(7-δ)超导体表面磁场分布的实验研究及模拟计算  

EXPERIMENTAL STUDY AND COMPUTATIONAL SIMULATION ON THE SURFACE FIELD OF A LARGE-SIZE YBa_2Cu_3O_(7-δ)SUPERCONDUCTOR

作　　者：黄钧伟[1] 刘峰[1] 刘伟[1] 肖玲[2] 任洪涛[2] 焦玉磊[2] 郑明辉[2] 阎守胜[1] 

机构地区：[1]北京大学物理系和介观物理国家实验室,北京100871 [2]北京有色金属研究总院,北京100088

出　　处：《低温物理学报》2001年第2期99-103,共5页Low Temperature Physical Letters

基　　金：国家自然科学基金!会 (批准号 :19740 0 1)资助项目

摘　　要：本文用 8个微型霍尔探头在场冷到液氮温度再瞬时去场条件下测量了一大尺寸圆柱状YBa2 Cu3O7-δ超导体的表面磁场垂直分量的分布 ,并选取一个简单的电流模型做模拟计算 ,从所得到的样品中体电流的大小推算出样品的钉扎力密度 .此方法有可能经改进成为检测大块超导样品的钉扎力密度的简便方法 .Using eight Micro-Hall probes we detected the vertical field component on the surface of a field-cooling YBa\-2Cu\-3O\-\{7-δ\} superconductor of size Φ16×6 at liquid nitrogen temperature in a condition when the field was turned off. A simple current model is adopted to simulate it theoretically. According to the current density obtained from the model the flux pinning force density of the sample was deduced. This process has a potential to become a convenient method by further improvement to detect the flux pining force of large size superconductors.

关 键 词：YBA2CU3O7-Δ超导体 表面磁场 实验研究 模拟计算 钉扎力 

分 类 号：O513[理学—低温物理]