期刊
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
卷 35, 期 3, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1361-6668/ac4ff1
关键词
iron-based superconductor; superconducting joint; critical current ratio; joint resistance
资金
- National Key R&D Program of China [2018YFA0704200, 2017YFE0129500]
- National Natural Science Foundation of China [51861135311, U1832213, 51721005]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB25000000]
- Key Research Program of Frontier Sciences of Chinese Academy of Sciences [QYZDJ-SSW-JSC026]
- International Partnership Program of Chinese Academy of Sciences [182111KYSB20160014]
This study estimated the connection resistance of iron-based superconducting joints for the first time using the field-decay method, and found that BaK-122 superconducting joints have great potential for a range of practical applications.
High-performance superconducting joints are the key to achieving persistent-mode magnets. Herein, the superconducting joints between Ba1-x K (x) Fe2As2 (BaK-122) superconducting tapes were prepared by a simple cold-pressing method, and the joint resistance of the iron-based superconducting joint was estimated by field-decay method for the first time. Via the scanning electron microscope (SEM), electron backscattered diffraction (EBSD), electron probe microanalysis (EPMA) and x-ray computed tomography (XCT) measurements, it is found that the joint sample CP80 shows fine performance. At 4.2 K and 10 T, a transport critical current I (c) of 105 A for the joint sample CP80 was measured, and the critical current ratio (CCR = Ijoint c/Itape c) of the joint was 94.6%. On the other hand, the joints exhibit a pretty low joint resistance of 2.7 x 10(-13) omega in self-field at 4.2 K. Among iron-based superconductors, we are the first to estimate the accurate resistance of iron-based superconducting joint by the field-decay method. All these show the great prospective to apply BaK-122 in a series of practical applications that require superconducting joints as key components.
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