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
Citations
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Evidences on reformation of (Bi,Pb)-2223 superconducting phase after complete peritectic melting
TL;DR: In this paper, it is demonstrated that it is possible to reform in air atmosphere considerable amounts of (Bi,Pb)-2223 phase within Ag environment after complete peritectic melting of this phase.
Journal Article
Double-Step Behavior of Critical Current vs. Magnetic Field in Y-
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.
Vanadium-Lead Doped Bi-2223 Superconductor
TL;DR: In this article, the effect of vanadium-lead doped in Bi-Sr-Ca-Cu-O superconducting system was studied and the results showed both critical temperature and 2223 phase formations were affected by vanadium and lead concentration.
Journal ArticleDOI
STRUCTURAL AND ELECTRICAL PROPERTIES OF HIGH AND LOW-DENSITY Yb-DOPED Bi(Pb)-2223 SUPERCONDUCTOR
TL;DR: In this paper, X-ray diffraction analysis (XRD) and resistivity measurement system were used to characterize high and low density Ytterbium (Yb)-doped of Bi(Pb)-2223.
Journal ArticleDOI
Suppression of Anti-ferromagnetism by K Doping in (Cu0.5Tl0.5−xKx)Ba2Ca2Cu3O10−δ Superconductors
Nawazish A. Khan,Safeer Hussain +1 more
TL;DR: In this paper, the density of mobile carriers in the inner CuO2 planes was enhanced by doping K at the charge reservoir layer by preparing (Cu 0.5Tl0.5−x K>>\s x )Ba2Ca2Cu3O10−δ¯¯ superconductors.
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.
TL;DR: The grain-boundary critical current densities in bicrystal films prepared by evaporation and postannealing and by laser ablation are in good agreement; this result demonstrates that the transport properties are insensitive to preparation technique and, thus, are not dominated by the diffusion of substrate impurities into the boundary region.
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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