High-Critical-Current-Density Epitaxial Films of SmBa2Cu3O7-xin High Fields

2005 ◽  
Vol 44 (No. 4) ◽  
pp. L129-L132 ◽  
Author(s):  
Yutaka Yoshida ◽  
Kaname Matsumoto ◽  
Yusuke Ichino ◽  
Masakazu Itoh ◽  
Ataru Ichinose ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Epitaxial Films ◽  
High Critical Current Density ◽  
High Fields

High critical current density in iron-clad MgB2 tapes

2003 ◽  
Vol 82 (23) ◽  
pp. 4113-4115 ◽  
Author(s):  
H. Fang ◽  
S. Padmanabhan ◽  
Y. X. Zhou ◽  
K. Salama
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Critical Current Density

Critical current density and microstructure variations in YBa2Cu3O7−x + BaSnO3 films with different concentrations of BaSnO3

2008 ◽  
Vol 23 (12) ◽  
pp. 3363-3369 ◽  
Author(s):  
C.V. Varanasi ◽  
J. Burke ◽  
L. Brunke ◽  
H. Wang ◽  
J.H. Lee ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Gradual Increase ◽  
Critical Transition ◽  
Critical Transition Temperature ◽  
Transmission Electron ◽  
Order Of Magnitude ◽  
High Fields ◽  
Magnitude Increase

Previous work on YBa2Cu3O7−x (YBCO) + BaSnO3 (BSO) films with a single composition showed significant critical current density (Jc) improvements at higher fields but lowered Jc in low fields. A detailed study on BSO concentrations provided here demonstrates that significant Jc enhancement can occur even up to 20 mol% BSO inclusion, where typical particulate inclusions in these concentrations degrade the YBCO performance. YBCO + BSO films were processed on (100) LaAlO3 substrates using premixed targets of YBa2Cu3O7-x (YBCO) with additions of 2, 4, 10, and 20 mol% BSO. The critical transition temperature Tc of the films remained high (>87 K), even with large amounts (20 mol%) of BSO. YBCO + BSO films showed a gradual increase in Jc at high fields as the amount of BSO was increased. More than an order of magnitude increase in Jc was measured in YBCO + BSO samples as compared to regular YBCO at 4 T. YBCO + 10 mol% BSO films showed overall improvement at all the field ranges while YBCO + 20 mol% BSO was better only at high fields. Transmission electron microscopy revealed the presence of ∼7–8-nm-diameter BSO nanocolumns, the density of which increased with increasing BSO content correlating well with the observed improvements in Jc.

High Critical Current Density YBa2Cu3O7-δ Tapes Prepared By Surface-Oxidation Epitaxy Method

2000 ◽  
pp. 577-579 ◽  
Author(s):  
Kaname Matsumoto ◽  
SeokBeom Kim ◽  
Izumi Hirabayashi ◽  
Tomonori Watanabe ◽  
Naoki Uno ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Surface Oxidation ◽  
High Critical Current Density
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