Role of interlayer coupling in alkaline-substituted (Bi, Pb)-2223 superconductors

Oh, J. Y.; Lee, Y.S.; Pham, An T.; Tran, Duc H.; Yang, Dong‐Seok; Kang, Byeongwon

doi:10.1016/j.jallcom.2019.07.029

Cited by 23 publications

(11 citation statements)

References 30 publications

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“…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%

“…As shown in Table 1 , the 2D conductivity exponent λ 2D values vary between 1.03 and 1.42. In this region, the charge carriers move along the CuO 2 planes and conductivity mainly occurs from charge carriers limited in the CuO 2 layers 52 . By further temperature reduction close to , the conductivity exponent decreases, and the 3D fluctuation region starts at T 3D-2D .…”

Section: Resultsmentioning

confidence: 99%

“…The final region is the dynamic critical region, where the fluctuations of the order parameter become comparable to the magnitude of the order parameter itself 7 . The Ginzburg–Landau theory breaks down and interaction between Cooper-pairs is assumed 52 . Crossing between the 3D region and the critical region occurs at T G .…”

Section: Resultsmentioning

confidence: 99%

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

Aftabi

Mozaffari

2021

Sci Rep

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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.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

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

Aftabi

Mozaffari

2021

Sci Rep

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“…The Josephson coupling constant E J is determined here to be 0.02567, which is similar to the data for polycrystalline, pure Bi-2223 [71], but considerably larger than that for Bi-2212 single crystals investigated by Mandal et al [62]. This is a remarkable result, which was originally not expected (see Section 3.1).…”

Section: Discussionsupporting

confidence: 87%

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

et al. 2020

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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.

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“…This is the regime where the conducting pairs start to form and its movement was limited in CuO2 layers [13,25]. When the temperature further decreases to lower than TLD, the CuO2 layers are connected by Josephson channeling that allows the conducting pairs to move between two CuO2 layers [26,27]. This region is 3D fluctuation with the critical exponent around λ = 0.5.…”

Section: Excess Conductivitymentioning

confidence: 99%

Excess Conductivity Analyses in Bi-Pb-Sr-Ca-Cu-O Systems Sintered at Different Temperatures

Dung¹,

An²,

Duong³

et al. 2021

MaP

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This paper studies the effects of the sintering temperature on crystal structure, critical temperature (Tc) and excess conductivity of Bi-Pb-Sr-Ca-Cu-O (BPSCCO) system. Bulk BPSCCO samples were fabricated by the solid-state reaction method. Four different temperatures of 835 °C, 840 °C, 845 °C, and 850 °C were applied to sinter four different samples. The crystal structure of the samples was investigated through X-ray diffraction measurements (XRD) and scanning electron microscopy (SEM). Superconductivity of the samples was analyzed by the temperature-dependent resistivity measurement. The experimental results showed the existence of both Bi-2223 and Bi-2212 phases in all samples. Quantitatively, the volume fraction of the Bi-2223 phase was found to increase from 53.56% to 75.97%, and the average grain size of Bi-2223 phase was observed to enlarge from 57.95 nm to 86.50 nm as the sintering temperature increased from 835 °C to 850 °C. In addition, the excess conductivity analyses based on the theory of Aslamazov - Larkin (AL) and Lawrence - Doniach (LD) showed decreases in the coherence lengths (ξc(0)) from 1.957 Å to 1.565 Å and the effective inter-layering spacing (d) from 79.7 Å to 64.5 Å. Meanwhile, the interlayer coupling strength (J) between two CuO2 planes was estimated to increase from 0.00083 to 0.00137. These results might be evidence to conclude that the increasing of the sintering temperature obviously improves the superconductivity in the BPSCCO system.

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Role of interlayer coupling in alkaline-substituted (Bi, Pb)-2223 superconductors

Cited by 23 publications

References 30 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

Excess Conductivity Analyses in Bi-Pb-Sr-Ca-Cu-O Systems Sintered at Different Temperatures

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