Title :
Measurement of the transition temperature distribution and magnetic field profile of large superconducting films
Author :
Jiang, Xiaohua ; Zhao, Zhongxian ; Li, Hongcheng ; Zhou, Lei ; Yao, Jiusheng
Author_Institution :
Dept. of Electr. Eng., Tsinghua Univ., Beijing, China
fDate :
8/1/1999 12:00:00 AM
Abstract :
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
Keywords :
Hall effect transducers; barium compounds; critical current density (superconductivity); high-temperature superconductors; magnetic field measurement; magnetic sensors; superconducting thin films; superconducting transition temperature; yttrium compounds; 30 mm; AC inductive method; Hall device; YBa2Cu3O7-δ thin-film; YBaCuO; automatic scanning; contactless measurement; critical current density; large superconducting films; magnetic field profile measurement; nondestructive measurement; step motor driven; surface profile; transition temperature distribution measurement; trapped magnetic field; two-coaxial-winding coil; Magnetic field measurement; Magnetic sensors; Probes; Superconducting coils; Superconducting films; Superconducting magnets; Superconducting transition temperature; Temperature distribution; Temperature measurement; Transistors;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
