DEPENDENCE OF CRITICAL CURRENT ON TEMPERATURE FOR DIRTY TYPE-II SUPERCONDUCTORS

1989 ◽  
Vol 03 (06) ◽  
pp. 489-492
Author(s):  
Z. YU ◽  
S.Y. DING ◽  
K.X. SHI ◽  
J.L. YAN
Keyword(s):  
Temperature Dependence ◽  
Critical Current ◽  
Electron Scattering ◽  
Flux Pinning ◽  
Multilayer Films ◽  
Experimental Results ◽  
Type Ii ◽  
Defect Model ◽  
Pinning Mechanism ◽  
Type Ii Superconductors

Based on the non-ideal planar defect model developed by the authors earlier and electron scattering flux pinning mechanism, we have derived a temperature dependence of critical current which predicts a same relation for both of I c and H c2 in dirty type-II superconductors. In order to test the prediction, the I c (T) and H c2 (T) were measured on PbBi-SiO multilayer films. The agreement between the theoretical and experimental results is satisfactory.

Flux pinning and critical current in layered type-II superconductors in parallel magnetic fields

1995 ◽  
Vol 51 (2) ◽  
pp. 1270-1276 ◽  
Author(s):  
Vesna Prokić ◽  
Dragomir Davidović ◽  
Ljiljana Dobrosavljević-Grujić
Keyword(s):  
Magnetic Fields ◽  
Critical Current ◽  
Flux Pinning ◽  
Type Ii ◽  
Type Ii Superconductors ◽  
Parallel Magnetic Fields

Anisotropic critical current density and flux pinning mechanism of Fe1+yTe0.6Se0.4 single crystals

2021 ◽  
Author(s):  
Yongqiang Pan ◽  
Nan Zhou ◽  
Bencheng Lin ◽  
Jinhua Wang ◽  
Zengwei Zhu ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Single Crystals ◽  
Critical Current ◽  
Current Density ◽  
Flux Pinning ◽  
Magnetic Hysteresis ◽  
Magnetic Hysteresis Loop ◽  
Pinning Force ◽  
Magnetization Relaxation ◽  
Pinning Mechanism

Abstract Fe1+yTe0.6Se0.4 has considerable application potential due to its large critical current density (J c) and high upper critical magnetic field (H c2). However, the uncertainty of the anisotropy of J c and the unclear flux-pinning mechanism have limited the application of this material. In this study, the J c in three directions were obtained from magnetic hysteresis loop measurements. A large anisotropy of J c ab /J c c ~ 10 was observed, and the origin of the anisotropy was discussed in details. Flux pinning force densities (F p) were obtained from J c, and a non-scaling behavior was found in the normalized pinning force f p[F p/F p-max] versus the normalized field h[H/H c2]. The peaks of pinning force shift from a high h to a low h with increasing temperature. Based on the vortex dynamics analysis, the peak shift was found to originate from the magnetization relaxation. The J c and F p at critical states free from the magnetic relaxation were regained. According to the Dew-Hughes model, the dominant pinning type in Fe1+yTe0.6Se0.4 clean single crystals was confirmed to be normal point pinning.

Observation of the crossover between bulk flux pinning and Josephson phase slips in the critical current of granular superconducting NbN/AlN multilayer films

1991 ◽  
Vol 174 (4-6) ◽  
pp. 340-344 ◽  
Author(s):  
K.E. Gray ◽  
R.T. Kampwirth ◽  
D.J. Miller ◽  
J.M. Murduck ◽  
D. Hampshire ◽  
...  
Keyword(s):  
Critical Current ◽  
Flux Pinning ◽  
Multilayer Films ◽  
Phase Slips

Flux pinning in thermodynamically reversible type II superconductors

Cryogenics ◽  
1969 ◽  
Vol 9 (2) ◽  
pp. 119-121 ◽  
Author(s):  
E.L. Andronikashvili ◽  
J.G. Chivinadze ◽  
R.M. Kerr ◽  
J. Lowell ◽  
K. Mendelssohn ◽  
...  
Keyword(s):  
Flux Pinning ◽  
Type Ii ◽  
Type Ii Superconductors
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