Engineered flux-pinning centers in Bi2Sr2CaCu2Ox and TIBa2Ca2Cu3Ox superconductors

1995 ◽  
Vol 24 (12) ◽  
pp. 1961-1966 ◽  
Author(s):  
K. C. Goretta ◽  
V. R. Todt ◽  
D. J. Miller ◽  
M. T. Lanagan ◽  
Y. L. Chen ◽  
...  
Keyword(s):  
Flux Pinning ◽  
Pinning Centers

The stability of dislocation networks under various oxygen-doping conditions in superconducting Bi2Sr2CaCu2Oy single crystals and their influence on the flux pinning properties

1994 ◽  
Vol 52 ◽  
pp. 802-803
Author(s):  
Y. Feng ◽  
X. Y. Cai ◽  
R. J. Kelley ◽  
D. C. Larbalestier
Keyword(s):  
Single Crystals ◽  
Oxygen Content ◽  
Basal Plane ◽  
Flux Pinning ◽  
Pinning Centers ◽  
Before And After ◽  
Anomalous Peak ◽  
Basal Plane Dislocation ◽  
The Stability ◽  
Further Development

The issue of strong flux pinning is crucial to the further development of high critical current density Bi-Sr-Ca-Cu-O (BSCCO) superconductors in conductor-like applications, yet the pinning mechanisms are still much debated. Anomalous peaks in the M-H (magnetization vs. magnetic field) loops are commonly observed in Bi2Sr2CaCu2Oy (Bi-2212) single crystals. Oxygen vacancies may be effective flux pinning centers in BSCCO, as has been found in YBCO. However, it has also been proposed that basal-plane dislocation networks also act as effective pinning centers. Yang et al. proposed that the characteristic scale of the basal-plane dislocation networksmay strongly depend on oxygen content and the anomalous peak in the M-H loop at ˜20-30K may be due tothe flux pinning of decoupled two-dimensional pancake vortices by the dislocation networks. In light of this, we have performed an insitu observation on the dislocation networks precisely at the same region before and after annealing in air, vacuumand oxygen, in order to verify whether the dislocation networks change with varying oxygen content Inall cases, we have not found any noticeable changes in dislocation structure, regardless of the drastic changes in Tc and the anomalous magnetization. Therefore, it does not appear that the anomalous peak in the M-H loops is controlled by the basal-plane dislocation networks.

Flux Pinning Characteristics of Artificial Pinning Centers With Different Dimension

2009 ◽  
Vol 19 (3) ◽  
pp. 3248-3253 ◽  
Author(s):  
K. Matsumoto ◽  
P. Mele ◽  
A. Ichinose ◽  
M. Mukaida ◽  
Y. Yoshida ◽  
...  
Keyword(s):  
Flux Pinning ◽  
Pinning Centers ◽  
Artificial Pinning Centers

Study of Growth Process for YBa2Cu3Oy Coated Conductors With BaZrO 3 Flux Pinning Centers by Monitoring Electrical Conductivity

2018 ◽  
Vol 28 (4) ◽  
pp. 1-5 ◽  
Author(s):  
Ryo Teranishi ◽  
Kazuki Konya ◽  
Masayoshi Inoue ◽  
Yukio Sato ◽  
Kenji Kaneko ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Flux Pinning ◽  
Growth Process ◽  
Coated Conductors ◽  
Pinning Centers

Artificial 2D Flux Pinning Centers in MgB2 Induced by Graphitic-Carbon Nitride Coated on Boron for Superconductor Applications

2019 ◽  
Vol 2 (9) ◽  
pp. 5399-5408 ◽  
Author(s):  
Wenxian Li ◽  
Jiancheng Li ◽  
Yang Liu ◽  
Jiangtao Qu ◽  
Bin Liu ◽  
...  
Keyword(s):  
Flux Pinning ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Pinning Centers

Flux Pinning Characteristics of ${\rm Sm}_{1+x}{\rm Ba}_{2-x}{\rm Cu}_{3}{\rm O}_{y}$ Films With the Additional $c$-Axis Correlated Pinning Centers

2009 ◽  
Vol 19 (3) ◽  
pp. 3507-3510 ◽  
Author(s):  
T. Ozaki ◽  
Y. Yoshida ◽  
Y. Ichino ◽  
T. Harada ◽  
Y. Takai ◽  
...  
Keyword(s):  
Flux Pinning ◽  
Pinning Centers

Properties and Flux Pinning of Cu-Nb Superconductors With Nanometric-Scale Pinning Centers

2005 ◽  
Vol 15 (2) ◽  
pp. 3389-3392 ◽  
Author(s):  
D. Rodrigues ◽  
C.A. Rodrigues ◽  
E.B. Silveira ◽  
E.G.M. Romao
Keyword(s):  
Flux Pinning ◽  
Pinning Centers

BYZO Nanopancakes in HTS YBa2Cu3O7-δ Films: Effect on Critical Current Density and Nonlinear Microwave Response

2011 ◽  
Vol 1367 ◽  
Author(s):  
Victor S. Flis ◽  
Vassily L. Svetchnikov ◽  
Oleksa A. Kalenyuk ◽  
Alexander L. Kasatkin ◽  
Viacheslav O. Moskaliuk ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Current Density ◽  
Flux Pinning ◽  
Electric Transport ◽  
Microwave Response ◽  
Pinning Centers ◽  
Thermally Activated ◽  
Different Types ◽  
Substrate Temperatures ◽  
Elastic Strains

ABSTRACTWe have studied nanostructure, electric transport and microwave properties of HTS YBa2Cu3O7-δ films prepared by PLD on LaAlO3 single crystal substrates using targets doped with BaZrO3. Two essentially different types of nanoparticles are revealed by HREM: “nanopancakes” and “nanorods”. Tiny nanopancakes are 1-4 nm in ab-plane and only few atomic layers thick. Nanopancakes are surrounded with deformed area and numerous dislocations. Such nanoparticles seem to be responsible for jc enhancement. Nanopancakes evolve to much wider and longer nanorods at higher substrate temperatures and/or slower deposition. There are no dislocations around nanorods. Elastic strains are avoided due to slight inclination of the c-axis. Dislocations around nanopancakes are suggested to be additional flux pinning centers and retard thermally activated relaxation of the dislocation nanostructure.

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