Measurement of Critical Current Density in Bulk Superconductors Based on Small Point Contact Characterization

2013 ◽  
Vol 26 (5) ◽  
pp. 1485-1488
Author(s):  
Nahid Hosseini ◽  
Alireza Zabetian ◽  
Siavash Kananian ◽  
Mehdi Fardmanesh
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Point Contact ◽  
Bulk Superconductors ◽  
Small Point

YBCO Bulk Superconductors with Sm Addition

2017 ◽  
Vol 891 ◽  
pp. 483-488 ◽  
Author(s):  
Daniela Volochová ◽  
Vitaliy Antal ◽  
Jozef Kováč ◽  
Pavel Diko
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Superconducting Properties ◽  
Ybco Bulk ◽  
Pinning Centers ◽  
Bulk Superconductors ◽  
Powder Addition ◽  
Current Densities ◽  
Precursor Powders

The influence of Sm addition on the microstructure and superconducting properties of Y-Ba-Cu-O (YBCO) bulk superconductors has been studied. Precursor powders YBa2Cu3O7-δ (Y-123), Y2O3 and CeO2 were enriched with different amounts of SmBa2Cu3Oy (Sm-123) or Sm2O3 powders with the aim to increase critical current density, Jc,by introducing additional pinning centers. YBCO bulk superconductors with SmBa2Cu3Oy (Y123-Sm) or Sm2O3 (Y123-SmO) powder addition were prepared by the optimized top seeded melt growth process in the form of single grains. Microstructure analysis revealed that Sm2O3 addition leads to a higher amount of smaller Y2BaCuO5 (Y-211) particles, what is related to high critical current densities (Jc ~ 7 x 104 A/cm2) of the YBCO samples with Sm2O3 addition in low magnetic fields. The effect of Sm addition in the form of SmBa2Cu3Oy as well as Sm2O3 powder on Y2BaCuO5 particle size, critical temperature, Tc, and critical current density, Jc, is reported.

Critical Current Density of the YBa2Cu3O7-δ Superconductor as Affected by Microstructuralxontrol

1987 ◽  
Vol 99 ◽  
Author(s):  
S. Jin ◽  
R. C Sherwood ◽  
T. H. Tiefel ◽  
R. B. van Dover ◽  
G. W. Kammlott ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Critical Current Density ◽  
Critical Current ◽  
Field Dependence ◽  
Current Density ◽  
Significant Deterioration ◽  
Bulk Superconductors ◽  
Weak Magnetic Fields ◽  
Microstructural Control

ABSTRACTThe recent discovery of the YBa2Cu3O7-δ type high Tc superconductors stimulated worldwide R&D interest in this field. However, the relatively low critical current density (Jc) in the polycrystalline, bulk superconductors (as well as its significant deterioration in weak magnetic fields) has been a major roadblock to the rapid technical advancement toward applications. In this paper, we investigated the effect of processing and microstructural control on Jc of the superconductor. Improved Jc values of -3100 A/cm2 at 77K with somewhat reduced field dependence have been obtained through appropriate microstructural modifications.

scholarly journals Critical Current Density of Melt Processed YBa2Cu3Ox Bulk Superconductors

1995 ◽  
Vol 115 (3) ◽  
pp. 245-250 ◽  
Author(s):  
Keiichi Kimura ◽  
Katsuyoshi Miyamoto ◽  
Misao Hashimoto ◽  
Teruo Matsushita
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Bulk Superconductors
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