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Analysis of Electromagnetic Properties of Bulk Superconductors
     
  
  
刊名:
Journal of Nanoscience and Nanotechnology
作者:
Sang Heon Lee
(Department of Electronic Engineering, Sunmoon University)
刊号:
710B0036
ISSN:
1533-4880
出版年:
2021
年卷期:
2021, vol.21, no.9
页码:
4941-4943
总页数:
3
分类号:
TB383
关键词:
YBa_2Cu_3O_(7-y)
;
Superconductor
;
Critical current density
;
Levitation force
;
Magnetic force
参考中译:
语种:
eng
文摘:
In the present study, a YBa_2Cu_3O_(7-y) bulk superconductor added with 5~10 wt% Ag was fabricated employing Sm123 as a seed to produce a superconductive single crystal. Metallic silver was added to the single crystal of YBa_2Cu_3O_(7-y) to remove defects such as cracks and pores. Electromagnetic properties of the bulk superconductor at 77 K were analyzed based on relationships of magnetic levitation, trapped magnetic force, and critical current density. The critical current density of the superconductor at 77 K and 0 T was 3.53 × 10~4 A/cm~2. Discontinuous points in the distribution of magnetic field lines were not observed, implying that these two specimens grew well as a single crystal without specific weak links. For the growth of a superconductive nano crystal employing slow cooling at temperature of formation of 123 phase, superconductive nano crystals were aligned in a-b direction, the direction of peak current flow. The peak value of the trapped magnetic force of the YBa_2Cu_3O_(7-y) superconductor specimen was 3.23 kG. Using the FC method, peak forces of attraction and repulsion were 21.696 N and 70.168 N, respectively.
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