Effect of Ni substitute in off-stoichiometric Bi(Pb)-Sr-Ca-Cu(Ni)-O superconductor. Excess conductivity, XRD analysis and thermal behaviour

Harabor, A.; Rotaru, P.; Harabor, N. A.

doi:10.1016/j.ceramint.2018.09.060

Cited by 16 publications

(6 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4 a. The obtained values for these parameters have a good agreement with reported values for (Bi, Pb)-2223 phase 9 , 49 , 52 . The obtained short coherence length (few Å) for prepared samples is generally a trait of the HTS materials and is caused by the presence of the overlapping energy bands 15 .…”

Section: Resultssupporting

confidence: 89%

Fluctuation induced conductivity and pseudogap state studies of Bi1.6Pb0.4Sr2Ca2Cu3O10+δ superconductor added with ZnO nanoparticles

Aftabi

Mozaffari

2021

Sci Rep

View full text Add to dashboard Cite

The major limitations of the Bi1.6Pb0.4Sr2Ca2Cu3O10+δ superconductor are weak flux pinning capability and weak inter-grains coupling that lead to a low critical current density and low critical magnetic field which impedes the suppleness of this material towards practical applications. The addition of nanoscales impurities can create artificial pining centers that may improve flux pinning capability and intergranular coupling. In this work, the influences of ZnO nanoparticles on the superconducting parameters and pseudogap properties of the Bi1.6Pb0.4Sr2Ca2Cu3O10+δ superconductor are investigated using fluctuation induced conductivity analyses. Results demonstrate that the ZnO nanoparticles addition improves the formation of the Bi1.6Pb0.4Sr2Ca2Cu3O10+δ phase significantly. Various superconducting parameters include coherence length along c-axis (ξc(0)), penetration depth (λpd(0)), Fermi velocity (vF), Fermi energy (EF), lower and upper critical magnetic fields (Bc1(0) and Bc2(0) respectively) and critical current density (Jc(0)), are estimated for samples with different amounts of ZnO nanoparticles. It is found that the values of the Bc1(0), Bc2(0), and Jc(0) are improved significantly in the 0.2 wt% ZnO added sample in comparison to the ZnO-free sample. The magnitude and temperature dependence of the pseudogap Δ*(T) is calculated using the local pairs model. The obtained values of Tpair, the temperature at which local pairs are transformed from strongly coupled bosons into the fluctuating Cooper pairs, increases as the added ZnO nanoparticles concentration enhances up to 0.2 wt%. Also, the estimated values for the superconducting gap at T = 0 K (Δ(0)) are decreased from about 26 meV in ZnO-free sample to about 22 meV in 0.2 wt% ZnO added sample and then increases for higher values of additive.

show abstract

Section: Resultssupporting

confidence: 89%

Fluctuation induced conductivity and pseudogap state studies of Bi1.6Pb0.4Sr2Ca2Cu3O10+δ superconductor added with ZnO nanoparticles

Aftabi

Mozaffari

2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Several types of Bi-2212 samples were already analyzed by means of excess conductivity/fluctuation-induced conductivity in the literature. This comprises single crystals [62] polycrystalline bulks [63][64][65], polycrystalline Bi-2212 doped with Ni, La [66][67][68], and Bi-2212 thin films [69]. Several authors found the missing 1D fluctuation regime in their Bi-2212 samples, and a similar observation was made when studying the Y-358 compound [70].…”

Section: Discussionmentioning

confidence: 68%

Microstructure and Fluctuation-Induced Conductivity Analysis of Bi2Sr2CaCu2O8+δ (Bi-2212) Nanowire Fabrics

et al. 2020

View full text Add to dashboard Cite

Resistance measurements were performed on Bi2Sr2CaCu2O8+δ (Bi-2212) fabric-like nanowire networks or nanofiber mats in the temperature interval 3 K ≤T≤ 300 K. The nanowire fabrics were prepared by means of electrospinning, and consist of long (up to 100 μm) individual nanowires with a mean diameter of 250 nm. The microstructure of the nanowire network fiber mats and of the individual nanowires was thoroughly characterized by electron microscopy showing that the nanowires can be as thin as a single Bi-2212 grain. The polycrystalline nanowires are found to have a texture in the direction of the original polymer nanowire. The overall structure of the nanofiber mats is characterized by numerous interconnects among the nanowires, which enable current flow across the whole sample. The fluctuation-induced conductivity (excess conductivity) above the superconducting transition temperature, Tc, was analyzed using the Aslamzov-Larkin model. Four distinct fluctuation regimes (short-wave, two-dimensional, three-dimensional and critical fluctuation regimes) could be identified in the Bi-2212 nanowire fabric samples. These regimes in such nanowire network samples are discussed in detail for the first time. Based on this analysis, we determine several superconducting parameters from the resistance data.

show abstract

“…It had been shown that introducing arti cial pinning centers in the superconducting matrices, apart from those which occur naturally, is a very effective method to avoid vortex motion and improve the ux pinning capability and superconducting transport properties [8,10,[27][28][29][30][31]. Different techniques such as chemical doping [17,[32][33][34], high energy ions irradiation [31,35], and different types of additives [1,2,[36][37][38][39][40][41][42][43] were used in the literature for this purpose. It has been proved that the appropriate amount of nanosized additives could improve the microstructure, intergranular coupling, and ux pining capability of the high-temperature ceramic superconductors [2, 36-39, 42, 44, 45].…”

Section: ( )mentioning

confidence: 99%

Thermally activated flux flow and inter-granular coupling properties in (Bi, Pb)-2223 superconductor added with ZnO nanoparticles

Aftabi

Mozaffari

2022

Preprint

View full text Add to dashboard Cite

In high-temperature ceramic superconductors, vortices motion is caused by the strong thermal fluctuations due to the thermally activated flux flow (TAFF). The TAFF impedes the transport properties and critical current density of superconductors. It has been reported that the addition of nanoscale impurities can create artificial pining centers that may improve flux pinning capability and inter-granular coupling in ceramic superconductors. Here, the effects of different amounts (0.0 to 1.0 wt%) of ZnO nanoparticles on the TAFF behavior and zero temperature activation energy of the Bi1.6Pb0.4Sr2Ca2Cu3O10+δ superconducting phase have been studied using the modified TAFF model. Moreover, the impacts of the additive on the inter-granular traits and the Josephson coupling energy of the superconducting phase have been investigated using AC susceptibility measurements. Results indicate that the vortex phases for all composites are divided into three vortex regions, but the temperature ranges in each region are different for various amounts of the additives. A vortex glass to vortex liquid transition at Tg was obtained from the analysis. The vortex liquid region is divided into the critical and TAFF ones. It was found that the TAFF region is shifted to the higher temperatures and gets narrower by adding the ZnO nanoparticles up to 0.2 wt%. The Tg increases from 93.8 K for the ZnO free sample to 101.0 K for the sample with 0.2 wt% ZnO nanoparticles. In addition, the zero temperature activation energy (U0/KB) increases from ~ 0.4×105 K for the ZnO free sample to ~ 1.4×105 K for the sample with 0.2 wt% ZnO nanoparticles and then decreases for higher values of additive. Moreover, it was found that the Josephson coupling energy Ej increases from ~ 0.037 eV for ZnO free sample to ~ 0.130 eV for the sample with 0.2 wt% additives. These results point out the significant improvement of the flux pinning capability and inter-granular coupling of the Bi1.6Pb0.4Sr2Ca2Cu3O10+δ superconducting phase with the addition of the 0.2 wt% ZnO nanoparticles.

show abstract

Effect of Ni substitute in off-stoichiometric Bi(Pb)-Sr-Ca-Cu(Ni)-O superconductor. Excess conductivity, XRD analysis and thermal behaviour

Cited by 16 publications

References 49 publications

Fluctuation induced conductivity and pseudogap state studies of Bi1.6Pb0.4Sr2Ca2Cu3O10+δ superconductor added with ZnO nanoparticles

Fluctuation induced conductivity and pseudogap state studies of Bi1.6Pb0.4Sr2Ca2Cu3O10+δ superconductor added with ZnO nanoparticles

Microstructure and Fluctuation-Induced Conductivity Analysis of Bi2Sr2CaCu2O8+δ (Bi-2212) Nanowire Fabrics

Thermally activated flux flow and inter-granular coupling properties in (Bi, Pb)-2223 superconductor added with ZnO nanoparticles

Contact Info

Product

Resources

About