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Measurement of the transition temperature distribution and magnetic field profile of large superconducting films

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5 Author(s)
Xiaohua Jiang ; Dept. of Electr. Eng., Tsinghua Univ., Beijing, China ; Zhao, Zhongxian ; Hongcheng Li ; Lei Zhou
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A novel apparatus has been developed to measure the transition temperature (Tc) distribution and magnetic field profile of large superconducting films. Two techniques were used. The first one is an ac inductive method which provides a contactless measurement of Tc. The second technique employs a Hall device to measure magnetic field. Driven by two step motors, the measuring probe, either a two-coaxial-winding coil or a Hall sensor, can move over the sample on a polar plane. As the probe scans the sample step by step, various points on the sample are measured one by one. Experiments were carried out on a 30 mm diameter YBa2Cu3O7-δ thin-film. The Tc distribution and the surface profile of trapped magnetic field were obtained

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Instrumentation and Measurement, IEEE Transactions on  (Volume:48 ,  Issue: 4 )