The Detailed Investigation of the Critical Current Density of Optimized Nb3Sn Modified Jelly Roll Wire throughout Its Entire Superconducting Phase Including a Comparative Study with a Similar Non-Optimized Composite

1987 ◽  
Vol 141 (1) ◽  
pp. 229-237 ◽  
Author(s):  
D. P. Hampshire ◽  
H. Jones
Keyword(s):  
Critical Current Density ◽  
Comparative Study ◽  
Critical Current ◽  
Current Density ◽  
Superconducting Phase ◽  
Jelly Roll

Comparative Study of Thickness Dependence of Critical Current Density of Yba2Cu3O7–δ on (100) SrTiO3 and on Rolling-assisted Biaxially Textured Substrates

2002 ◽  
Vol 17 (7) ◽  
pp. 1750-1757 ◽  
Author(s):  
B. W. Kang ◽  
A. Goyal ◽  
D. F. Lee ◽  
J. E. Mathis ◽  
E. D. Specht ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Critical Current Density ◽  
Film Thickness ◽  
Comparative Study ◽  
Critical Current ◽  
Current Density ◽  
Pulsed Laser ◽  
Cube Texture ◽  
Laser Deposition ◽  
Ybco Films

We investigated the dependence of critical current density (Jc) on thickness of Yba2Cu3O7−δ (YBCO) films grown by pulsed laser deposition on (100) SrTiO3 (STO) and on rolling-assisted biaxially textured substrates (RABiTS). The thickness of YBCO films varied from 0.19 to 3 μm. The highest Jcs of 5.3 and 2.6 MA/cm2 at 77 K, self-field were obtained for 0.19-μm YBCO films on STO and RABiTS, respectively. Jc was found to decrease exponentially with YBCO thickness on both substrates. However, the results suggest different mechanisms are responsible for the Jc reduction in the two cases. On STO, growth of a-axis grains within c-axis films and broadening of the in-plane texture were observed in thick films. On RABiTS, degradation in cube texture as well as development of a porous surface morphology were found to correlate with film thickness.

Effects of Tin Addition to the Tl-Based 1223 Superconducting System

1998 ◽  
Vol 12 (04) ◽  
pp. 131-141 ◽  
Author(s):  
Y. T. Wang ◽  
A. M. Hermann
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Temperature Drop ◽  
Superconducting Phase ◽  
Transport Critical Current Density ◽  
X Ray Diffraction ◽  
Pinning Centers ◽  
Magnetization Data ◽  
A Minor

Polycrystalline samples of Tl-based-1223 superconducting system were prepared with tin-addition to form ( Tl 0.5 Pb 0.5) Sn x Sr 1.6 Ca 2.4 Cu 3 O y, for x=0–0.3. X-ray diffraction data showed the presence of a minor 1212 phase and impurities which increased with increasing x while the samples without addition of tin, x=0, were nearly single phase of Tl,Pb-1223. The effects of tin addition to Tl,Pb-1223 on the magnetic properties were studied by dc susceptibility and hysteresis magnetization measurements. The magnetic results revealed a significant enlargement of hysteresis magnetization in tin-added samples with an onset transition temperature drop of only 1–4 K. According to recent measurements, the intragrain Jc reflects the transport critical current density in high field region. The critical current density in Tl,Pb-1223 was enhanced by as much as ten-times by tin-addition. An electron micro-probe technique was employed to locate the added tin in the samples, but Sn incorporated into the superconducting phase was below detectability. The variation in Tc with Sn addition and a reduction in pinning strength at Sn concentration above x=0.05 show that the enhanced pinning is due to introduction of pinning centers into the superconducting phase even though micro-probe analysis indicates that most of the Sn is present in a nonsuperconducting phase. The field dependence and time dependence of the magnetization data showed an increased concentration of pinning centers without a change in pinning energy.

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