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弱场下熔融织构YBa2Cu3O7-δ样品局域磁通蠕动的实验研究

刘峰 黄钧伟 刘伟 肖玲 任洪涛 焦玉磊 郑明辉 阎守胜

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弱场下熔融织构YBa2Cu3O7-δ样品局域磁通蠕动的实验研究

刘峰, 黄钧伟, 刘伟, 肖玲, 任洪涛, 焦玉磊, 郑明辉, 阎守胜

EXPERIMENTAL STUDY OF LOCAL FLUX CREEP ON A CYLINDRICAL MELTING-TEXTURED GROWN YBa2Cu3O7-δ SAMPLE AT APPLIED FIELDS

LIU FENG, HUANG JUN-WEI, LIU WEI, XIAO LING, REN HONG-TAO, JIAO YU-LEI, ZHENG MING-HUI, YAN SHOU-SHENG
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  • 利用半导体霍尔探头测量法在液氮温度下研究了低场下圆柱状熔融织构YBa2Cu3O7-δ样品的局域磁通蠕动行为.对瞬时加减场样品端面局域磁场的磁弛豫,磁滞回线以及不同扫场速率下局域磁场的变化进行了测量,观察到了对数时间磁弛豫的行为,发现由加场和去场数据所得的激活能U0有明显的不同.磁滞回线测量中,局域点的磁场随外场几乎同步变化,不同扫场速率下局域磁场随外场变化的差别不大.实验结果表明,外场除对样品侧面外,对端面也有明显的穿
    Using semiconductor Hall probes,we studied the local flux creep on a cylindrical melting-textured grown YBa2Cu3O7-δ sample at liquid nitrogen temperature and low applied field.The measurements on the top surface of the sample show that the local flux creep fits well the logarithmic time dependence in both the field-on and field-off cases.The obtained activation energy U0 in the field-on case is greater than the field-off one.The local magnetization was almost changing with the applied field synchronously in the measurement of magnetic hysteresis loops.The field was almost identical at a fixed local point under various sweep ratios of the applied field.The results imply that besides the side surface the applied field penetrates into the upper and lower surfaces to a certain extent too.The disparity in U0 results from the difference of the angle between the flux line and the ab plane.This study also shows that the measurement of flux creep at the low field has a potential to become a simple and effective method to investigate the pinning property in large size samples.
    • 基金项目: 国家自然科学基金(批准号:19734001);教育部博士点基金资助的课题.
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  • 文章访问数:  6506
  • PDF下载量:  743
  • 被引次数: 0
出版历程
  • 收稿日期:  2001-04-14
  • 修回日期:  2001-05-23
  • 刊出日期:  2001-05-05

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