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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AC-susceptibility measurements of Cu1−xTlxBa2Ca3Cu4O12−δ superconductor thin films with different thallium content
TL;DR: In this article, the superconductivity of Cu 1− x Tl x Ba 2 Ca 3 Cu 4 O 12− δ (x ǫ= 0.8 and 0.5) thin films by AC-susceptibility measurements under various external AC magnetic field strengths was studied.
Journal ArticleDOI
Weak-link behaviour of Cu1−xTlxBa2Ca3Cu4O12−y superconductor thin films
TL;DR: In this article, the weak link behavior of superconductor thin films has been studied by magnetoresistance and ac-susceptibility measurements, and it was shown that the weak links are insulating and make a Josephson array of super-conductor-insulator-superconductor (SIS) junctions.
Journal ArticleDOI
Optimized Intergrain Connection and Transport Properties of Bi-2212 High-Temperature Superconductors by Ag Nanoparticles Inclusions
TL;DR: In this article, the influence of Ag inclusions on textural structures and related superconducting properties of polycrystalline bulks were systematically investigated, and an improvement of critical current density of over 60 % was obtained with the optimal Ag content of 0.250 wt %.
Journal ArticleDOI
Suppression of Tc in Co-doped (Cu0.5Tl0.5)Ba2Ca2Cu3−xCoxO10−δ superconductor
Nawazish A. Khan,Muhammad Waseem Mumtaz,Muhammad Waseem Mumtaz,Anayat Ullah,Najmul Hassan,A.A. Khurram +5 more
TL;DR: In this article, the authors showed that the increased free carrier density in the CuO2 planes enhances the superconducting properties of the final compound, since alkali metals are known to lose their outermost s-orbital electron easily.
Journal ArticleDOI
Effect of Mg doping in enhancing superconductivity in Ni doped (Cu0.5Tl0.25Li0.25)Ba2Ca2−yMgy (Cu1.5Ni1.5)O10−δ (y = 0, 0.5, 1.0, 1.5) superconductors
Nawazish A. Khan,Najmul Hassan +1 more
TL;DR: In this paper, the effect of enhanced interactions between the Ni +2 ions and the mobile carriers in the planes of superconductors has been investigated and it has been shown that the critical temperature and magnitude of diamagnetism are further enhanced by Li doping in the charge reservoir layer.
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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