大尺寸YBa2Cu3O7-δ超导体表面磁场分布的实验研究及模拟计算

低温物理学报 , 2001, 23(2): 99-103. doi: 10.3969/j.issn.1000-3258.2001.02.004

大尺寸YBa2Cu3O7-δ超导体表面磁场分布的实验研究及模拟计算

黄钧伟 ^1, , 刘峰 ^2, , 刘伟 ^3, , 阎守胜 ^4, , 肖玲 ^5, , 任洪涛 ^6, , 焦玉磊 ^7, , 郑明辉 ^8,

1.北京大学

2.北京大学

3.北京大学

4.北京大学

5.北京有色金属研究总院,

6.北京有色金属研究总院,

7.北京有色金属研究总院,

8.北京有色金属研究总院,

基金项目: 国家自然科学基金(1974001)

EXPERIMENTAL STUDY AND COMPUTATIONALSIMULATION ON THE SURFACE FIELDOF A LARGE-SIZE YBa2Cu3O7-δ SUPERCONDUCTOR

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YBa2Cu3O7-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 s urface of a field-cooling YBa2Cu3O7-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.

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