Journal ArticleDOI
The effect of Bi-2212 phase on the weak link behavior of Bi-2223 superconductors
Hadi Salamati,Parviz Kameli +1 more
TLDR
In this paper, a systematic study of the weak link behavior for (Bi,Pb)2Sr2Ca2Cu3Oy (Bi-2223) polycrystalline samples has been done using the electrical resistivity and AC susceptibility techniques.Abstract:
A systematic study of the weak link behavior for (Bi,Pb)2Sr2Ca2Cu3Oy (Bi-2223) polycrystalline samples has been done using the electrical resistivity and AC susceptibility techniques. In this project, we have prepared a series of Bi-2223 samples with different fractions of Bi-2212 phase and investigated its effect on the intergranular properties. It was found that the Bi-2212 phase exist within the grain boundaries, play a role of weak links and consequently reduces the intergranular coupling. Analysis of the temperature dependence of the AC susceptibility near the transition temperature (Tc) has been done employing Bean’s critical state model. The observed variation of intergranular critical current densities (Jc) with temperature indicates that the Jc decreases with the amount of Bi-2212 phase.read more
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Influence of Lead Fluoride Substitution on the Physical Properties of ($$ {\text{Cu}}_{0.5} {\text{Tl}}_{0.5} $$Cu0.5Tl0.5)-1223 Phase
TL;DR: In this article, the influence of lead fluoride on the physical properties of high-temperature superconductor samples was revealed by using X-ray powder diffraction (XRD), scanning electron microscope (SEM) and Fourier transform infrared (FTIR).
Journal ArticleDOI
The effect of current direction on superconducting properties of BSCCO fibres grown by an electrically assisted laser floating zone process
TL;DR: In this paper, the application of an electric current of 200 mA through the molten zone of BSCCO superconducting fibres during laser floating zone processing constitutes an upgrade for improving the grain alignment.
Journal ArticleDOI
Effect of K-doping to the weak link behaviour of (Cu0.5Tl0.5−xKx)Ba2Ca2Cu3O10−δ superconductors
Nawazish A. Khan,Safeer Hussain +1 more
TL;DR: In this paper, a systematic study of the weak link behavior for (Cu 0.5 Tl 0.25 K 0.6 Tl ) superconductors has been carried out using electrical resistivity and AC-susceptibility techniques, and it is concluded from these studies that potassium atoms appearing at the crystal boundaries enhance inter-grain coupling and pinning mechanism in K-doped (Ba 2 Ca 2 Cu 3 O 10− δ ) supercondors.
Journal ArticleDOI
On the Effect of Carbon Nano-Tubes Addition on Structure and Superconducting Properties of Bi(Pb)-2223 Phase
A. Saoudel,A. Amira,Y. Boudjadja,L. Amirouche,N. Mahamdioua,Ahmet Varilci,S.P. Altintas,Cabir Terzioglu +7 more
TL;DR: In this paper, a series of ceramic samples of Bi1.6Pb0.4Sr2Ca2Cu2Cu3O ycffff (Bi(Pb)-2223) added with different amounts (0, 0.2 and 0.4 wt%) of carbon nano-tubes (CNT) are prepared from commercial powders and characterized.
Journal ArticleDOI
Enhanced superconductivity by Na doping in (Cu0.5Tl0.25Na0.25)Ba2Ca2Cu3O10−δ
Nawazish A. Khan,Safeer Hussain +1 more
TL;DR: In this article, the reproducible method of doping the CuO2 planes in (Cu0.5Tl 0.5)Ba2Ca2Cu3O10−δ superconductor was studied.
References
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Journal ArticleDOI
Magnetization of High-Field Superconductors
TL;DR: Experimental results and phenomenological theory based on the sponge model for hysteretic high-field superconductors are given in this article, where the response of the supercondors to alternating fields superimposed upon steady fields is studied.
Journal ArticleDOI
Superconducting transport properties of grain boundaries in YBa2Cu3O7 bicrystals.
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Journal ArticleDOI
Flux creep and activation energies at the grain boundaries of Y-Ba-Cu-O superconductors
M. Nikolo,Ronald B. Goldfarb +1 more
TL;DR: The ac susceptibility of sintered sintering pellets is measured as a function of temperature and ac magnetic field amplitude and frequency to find the value for an intergrain decoupling field, above which flux creep presumably becomes flux flow at the grain boundaries.
Journal ArticleDOI
The atomic origins of reduced critical currents at [001] tilt grain boundaries in YBa2Cu3O7−δ thin films
Nigel D. Browning,James P. Buban,Peter D. Nellist,David P. Norton,M. F. Chisholm,S. J. Pennycook +5 more
TL;DR: In this paper, a combination of atomic resolution Z-contrast imaging and bond valence sum analysis was used to demonstrate that the atomic structure of the grain boundary dominates the transport properties of high-T c oxide superconductors.
Journal ArticleDOI
Double-step behavior of critical current vs. magnetic field in Y-, Bi- and Tl-based bulk high-Tc superconductors
TL;DR: In this article, a double step characteristic is observed at 76 K in the transport critical current as a function of magnetic field (10 -4 T to 10 T) in bulk sintered Y-, Bi-and Tl-based high-T c superconducting materials.
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