Critical current density and pinning mechanism in Hetero structure of Bi-2212 and MgB2 superconductors

2020 ◽  
Vol 45 (1) ◽  
pp. 160-165
Author(s):  
M. Padmavathi ◽  
R. Singh
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Pinning Mechanism ◽  
Hetero Structure ◽  
Mgb2 Superconductors

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.

Effect of Pulsed Magnetic Field Processing on MgB2 Superconductors

2007 ◽  
Vol 546-549 ◽  
pp. 2063-2066 ◽  
Author(s):  
W.X. Li ◽  
Ying Li ◽  
M.Y. Zhu ◽  
R.H. Chen ◽  
H.M. Jin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Pulsed Magnetic Field ◽  
Pinning Force ◽  
Critical Current Density Jc ◽  
Mgb2 Superconductors ◽  
Doped Mgb2 ◽  
Flux Pinning Force

Pulsed magnetic field was first employed in the study on MgB2 superconductors. Superconductivity properties and microstructures of Zn and SiC doped MgB2 were discussed in this paper. The superconductors showed different superconductivities after magnetic sintering. Critical current density and flux pinning force were relevant to the dopants properties in MgB2. Grains in the pulsed magnetic processed MgB2 matrix were smaller than those in the normal processed one. The refinement microstructures have caused the critical current density (Jc) anisotropy in both the Zn and SiC doped MgB2.

Enhancement of superconducting critical current density by Fe impurity substitution in NbSe2 single crystals and the vortex pinning mechanism

2017 ◽  
Vol 19 (18) ◽  
pp. 11230-11238 ◽  
Author(s):  
Rukshana Pervin ◽  
Manikanadan Krishnan ◽  
Amit Kumar Rana ◽  
M. Kannan ◽  
S. Arumugam ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Critical Current ◽  
Current Density ◽  
Vortex Pinning ◽  
Pinning Mechanism ◽  
Fe Impurity

This study demonstrates the temperature dependence of Hsb and Hlb for (a) NbSe2, (b) Fe0.0008NbSe2 and (c) Fe0.0011NbSe2 fitted with the δl and δTc pinning mechanism, respectively.

scholarly journals Improvement of critical current density in MgB2 superconductors by Zr doping at ambient pressure

2001 ◽  
Vol 79 (24) ◽  
pp. 3983-3985 ◽  
Author(s):  
Y. Feng ◽  
Y. Zhao ◽  
Y. P. Sun ◽  
F. C. Liu ◽  
B. Q. Fu ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Ambient Pressure ◽  
Mgb2 Superconductors

scholarly journals Low Sr doping effects on critical current density and pinning mechanism of YBa2Cu3O7-δsingle crystals

2014 ◽  
Vol 568 (2) ◽  
pp. 022014
Author(s):  
R F Lopes ◽  
V N Vieira ◽  
A P A Mendonça ◽  
F T Dias ◽  
D L da Silva ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Pinning Mechanism ◽  
Doping Effects

EFFECT OF NANO-Y-ZrO2 ADDITION ON THE MICROSTRUCTURE AND CRITICAL CURRENT DENSITY OF MgB2 SUPERCONDUCTORS

2004 ◽  
Vol 03 (04n05) ◽  
pp. 563-569 ◽  
Author(s):  
Q. W. YAO ◽  
X. L. WANG ◽  
A. H. LI ◽  
S. X. DOU ◽  
P. R. MUNROE
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Magnetic Measurements ◽  
Transmission Electron ◽  
Long Time ◽  
Powder Addition ◽  
Short Time ◽  
Mgb2 Superconductors

Polycrystalline MgB 2 samples with 0, 5, 10, and 20 wt% nano- Y - ZrO 2 (YSZ) powder addition were prepared by short time, as little as several minutes, or long time in-situ reaction process. The phases, microstructures and flux pinning behaviors were characterized using X-ray diffractometry (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscope (TEM) and Magnetic Measurements. Results indicated that nano-YSZ particles included in MgB 2 grains. Samples doped with 10wt% YSZ powders showed new record of critical current density Jc as high as 1×106 and 4×106 A/cm 2 in low magnetic fields at 30 and 20K, respectively. However, the Jc drops faster compared to that made by long time sintering samples. It is proposed that the improved Jc in low fields was due to the enhanced density of the sample, which was caused by the YSZ nano-particle inclusion.

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