Effect of oxygen content on flux pinning in Nd-Ba-Cu-O single crystals

2001 ◽  
Vol 11 (1) ◽  
pp. 3639-3642 ◽  
Author(s):  
Y. Feng ◽  
A.K. Pradhan ◽  
S. Shibata ◽  
T. Machi ◽  
N. Koshizuka
Keyword(s):  
Single Crystals ◽  
Oxygen Content ◽  
Flux Pinning ◽  
Effect Of Oxygen

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 associated with fishtail shaped hysteresis cycle in textured YBaCuO. Effect of oxygen content

1994 ◽  
Vol 235-240 ◽  
pp. 2809-2810 ◽  
Author(s):  
A. Fert ◽  
J.P. Redoulès ◽  
Ph. Odier ◽  
N. Pellerin
Keyword(s):  
Oxygen Content ◽  
Flux Pinning ◽  
Hysteresis Cycle ◽  
Effect Of Oxygen

Enhanced flux pinning and fishtail effect in spiral grown Bi2Sr2CaCu2Oy single crystals

1997 ◽  
Vol 282-287 ◽  
pp. 2125-2126 ◽  
Author(s):  
X.L. Wang ◽  
J. Horvat ◽  
H.K. Liu ◽  
S.X. Dou
Keyword(s):  
Single Crystals ◽  
Flux Pinning

Localization effects and pseudogap state in YBa2Cu3O7−δ single crystals with different oxygen content

2006 ◽  
Vol 32 (6) ◽  
pp. 571-575 ◽  
Author(s):  
M. A. Obolenskii ◽  
R. V. Vovk ◽  
A. V. Bondarenko ◽  
N. N. Chebotaev
Keyword(s):  
Single Crystals ◽  
Oxygen Content ◽  
Pseudogap State

Effect of oxygen content on the magnetic and transport properties of Pr0.5Ba0.5MnO3-γ

2000 ◽  
Vol 12 (7) ◽  
pp. L155-L158 ◽  
Author(s):  
I O Troyanchuk ◽  
S V Trukhanov ◽  
H Szymczak ◽  
K Baerner
Keyword(s):  
Transport Properties ◽  
Oxygen Content ◽  
Effect Of Oxygen
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