scholarly journals Variation of pinning mechanism and enhancement of critical current density in MgB2 bulk containing self-generated coherent MgB4 impurity

2013 ◽  
Vol 103 (13) ◽  
pp. 132601 ◽  
Author(s):  
Qi Cai ◽  
Yongchang Liu ◽  
Zongqing Ma ◽  
Huijun Li ◽  
Liming Yu
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Pinning Mechanism ◽  
Mgb2 Bulk

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.

Influence of heat treatment on the critical current density of MgB2 bulk sintered in vacuum and flowing Ar atmosphere

2008 ◽  
Vol 468 (15-20) ◽  
pp. 1366-1368 ◽  
Author(s):  
K.S. Tan ◽  
N.-K. Kim ◽  
Y.-J. Kim ◽  
B.-H. Jun ◽  
C.-J. Kim
Keyword(s):  
Heat Treatment ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Mgb2 Bulk

Critical current density in MgB2 bulk samples after co-doping with nano-SiC and poly zinc acrylate complexes

2011 ◽  
Vol 471 (21-22) ◽  
pp. 908-911 ◽  
Author(s):  
Z. Zhang ◽  
H. Suo ◽  
L. Ma ◽  
T. Zhang ◽  
M. Liu ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Co Doping ◽  
Mgb2 Bulk

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 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
Sign in / Sign up

Export Citation Format

Share Document