| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Slow Vortex Creep Induced by Strong Grain Boundary Pinning in Advanced Ba122 Superconducting Tapes |
| Chiheng Dong1, He Huang1,2, Yanwei Ma1,2** |
1Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190
2University of Chinese Academy of Sciences, Beijing 100049
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| Cite this article: |
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Chiheng Dong, He Huang, Yanwei Ma 2019 Chin. Phys. Lett. 36 067401 |
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Abstract We report the temperature, magnetic field and time dependences of magnetization in advanced Ba122 superconducting tapes. The sample exhibits peculiar vortex creep behavior. Below 10 K, the normalized magnetization relaxation rate $S=d\ln(-M)/d\ln(t)$ shows a temperature-insensitive plateau with a value comparable to that of low-temperature superconductors, which can be explained within the framework of collective creep theory. It then enters into a second collective creep regime when the temperature increases. Interestingly, the relaxation rate below 20 K tends to reach saturation with increasing the field. However, it changes to a power law dependence on the field at a higher temperature. A vortex phase diagram composed of the collective and the plastic creep regions is shown. Benefiting from the strong grain boundary pinning, the advanced Ba122 superconducting tape has potential to be applied not only in liquid helium but also in liquid hydrogen or at temperatures accessible with cryocoolers.
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Received: 18 January 2019
Published: 18 May 2019
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 51402292 and 51677179, the International Partnership Program of the Chinese Academy of Sciences under Grant Nos GJHZ1775 and 182111KYSB20160014, the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences under Grant No NoQYZDJ-SSW-JSC026, and the Strategic Priority Research Program of the Chinese Academy of Sciences under Grant No XDB25000000. |
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