scholarly journals Enhancement of critical current density in superconducting/magnetic multilayers with slow magnetic relaxation dynamics and large magnetic susceptibility

2012 ◽  
Vol 86 (6) ◽  
Author(s):  
Shi-Zeng Lin ◽  
Lev N. Bulaevskii
Keyword(s):  
Magnetic Susceptibility ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Magnetic Relaxation ◽  
Magnetic Multilayers ◽  
Relaxation Dynamics ◽  
Slow Magnetic Relaxation

scholarly journals Improvement of superconducting parameters of Bi1.6Pb0.4Sr 2Ca 2Cu 3O10+ δ added with Au nanoparticles

2018 ◽  
Vol 16 (38) ◽  
Author(s):  
Amal K. Jassim
Keyword(s):  
Electrical Resistivity ◽  
Magnetic Susceptibility ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Au Nanoparticles ◽  
Ac Magnetic Susceptibility ◽  
Critical Temperatures ◽  
Magnetization Measurements ◽  
Dc Electrical Resistivity

Samples of Bi1.6Pb0.4Sr2Ca2Cu3O10+δ superconductor were prepared by solid-state reaction method to study the effects of gold nanoparticles addition to the superconducting system, Nano-Au was introduced by small weight percentages (0.25, 0.50, 0.75, 1.0, and 1.25 weight %). Phase identification and microstructuralcharacterization of the samples were investigated using XRD and SEM. Moreover, DC electrical resistivity as a function of the temperature, critical current density Jc, AC magnetic susceptibility, and DC magnetization measurements were carried to evaluate the relative performance of samples. x-ray diffraction analysis showed that both (Bi,Pb)-2223 and Bi-2212 phases coexist in the samples having an orthorhombic crystal structure. Both the onset critical temperatures Tc (onset) and zero electrical resistivity critical temperatures Tc (R=0) of the samples were determined from the DC electrical resistivity measurements. An improvement of the superconducting transition temperature of 6.36 % was obtained with increasing Au nanoparticles to x = 1.25 wt.%, while the critical current density is improved by 220 %. AC magnetic susceptibility measurement showed that the diamagnetic fraction and intergranular coupling of the x = 1.25 wt.% sample are greater than those of the others. The variation of magnetization with temperature (M-T curve) of the samples was measured by cooling the sample in zero fields (ZFC) and an applied field of 10 Oe (FC). The results of AC magnetic susceptibility and DC magnetization measurements were in good agreement with DC electrical resistivity measurement.

scholarly journals Magnetic relaxation and critical current density ofMgB2thin films

2001 ◽  
Vol 64 (13) ◽  
Author(s):  
H. H. Wen ◽  
S. L. Li ◽  
Z. W. Zhao ◽  
H. Jin ◽  
Y. M. Ni ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Magnetic Relaxation

Magnetic relaxation and critical current density of the new superconductor MgB2

2002 ◽  
Vol 15 (3) ◽  
pp. 315-319 ◽  
Author(s):  
H H Wen ◽  
S L Li ◽  
Z W Zhao ◽  
H Jin ◽  
Y M Ni ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Magnetic Relaxation ◽  
New Superconductor

Noncontact estimation of critical current density and magnetic susceptibility in a ring-shaped high Tc superconductor

1991 ◽  
Vol 185-189 ◽  
pp. 2315-2316
Author(s):  
Y. Sakamoto ◽  
Y. Masuda ◽  
Y. Yokochi ◽  
T. Muranaka ◽  
S. Fujita ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Tc ◽  
High Tc Superconductor

THE EFFECT OF Ag-DOPING ON THE CRITICAL CURRENT DENSITY OF YBa2Cu3O7−δ SUPERCONDUCTORS

1988 ◽  
Vol 02 (02) ◽  
pp. 589-595 ◽  
Author(s):  
JUH TZENG LUE ◽  
J.H. KUNG ◽  
H.H. YEN ◽  
Y.C. CHEN ◽  
P.T. WU
Keyword(s):  
Magnetic Susceptibility ◽  
Electron Spin Resonance ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Copper Ions ◽  
Spectroscopic Studies ◽  
Photoelectron Emission ◽  
Ag Doping ◽  
Spin Resonance

The superconducting state and the transition temperature Tc of the interstitially Ag-doped YBa 2 Cu 3 O 7−δ are not changed even when the Ag concentration is increased up to 20%, whereas the substitutionally doped YBa 2 Cu 3−x Ag x O 7−δ system ceases to be superconductive when the contents x of Ag is over 1.2. Magnetic susceptibility measurement indicates that the interstitial Ag-doping yields higher diamagnetic signal and enhances the critical current density by 15 folds. Photoelectron emission and electron spin resonance spectroscopic studies elucidate that the copper ions change from diamagnetic to paramagnetic states at some doping levels.

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