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Fluctuation induced conductivity and pseudogap state studies of Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_10+? superconductor added with ZnO nanoparticles.

ABSTRACT: The major limitations of the Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_10+? 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 Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_10+? superconductor are investigated using fluctuation induced conductivity analyses. Results demonstrate that the ZnO nanoparticles addition improves the formation of the Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_10+? phase significantly. Various superconducting parameters include coherence length along c-axis (?_c(0)), penetration depth (?_pd(0)), Fermi velocity (v_F), Fermi energy (E_F), lower and upper critical magnetic fields (B_c1(0) and B_c2(0) respectively) and critical current density (J_c(0)), are estimated for samples with different amounts of ZnO nanoparticles. It is found that the values of the B_c1(0), B_c2(0), and J_c(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 ?*(T) is calculated using the local pairs model. The obtained values of T_pair, 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 (?(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.

SUBMITTER: Aftabi A

PROVIDER: S-EPMC7900248 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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

Aftabi Ali A Mozaffari Morteza M

Scientific reports 20210222 1

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 ...[more]

PMID: 33619318

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Project description:The further development of solid oxide fuel and electrolysis cells (SOFC/SOEC) strongly relies on research activities dealing with electrode materials. Recent studies showed that under operating conditions many perovskite-type oxide electrodes are prone to changes of their surface composition, leading to severe changes of their electrochemical performance. This results in a large scatter of data in literature and complicates comparison of materials. Moreover, little information is available on the potentially excellent properties of surfaces immediately after preparation, that is, before any degradation by exposure to other gas compositions or temperature changes. Here, we introduce in situ impedance spectroscopy during pulsed laser deposition (IPLD) as a new method for electrochemical analysis of mixed ionic and electronic conducting (MIEC) thin films during growth. First, this approach can truly reveal the properties of as-prepared MIEC electrode materials, since it avoids any alterations of their surface between preparation and investigation. Second, the measurements during growth give information on the thickness dependence of film properties. This technique is applied to La0.6Sr0.4CoO3-? (LSC), one of the most promising SOFC/SOEC oxygen electrode material. From the earliest stages of LSC film deposition on yttria-stabilized zirconia (YSZ) to a fully grown thin film of 100 nm thickness, data are gained on the oxygen exchange kinetics and the defect chemistry of LSC. A remarkable reproducibility is found in repeated film growth experiments, not only for the bulk related chemical capacitance but also for the surface related polarization resistance (±10%). Polarization resistances of as-prepared LSC films are extraordinarily low (2.0 ? cm2 in 40 ?bar O2 at 600 °C). LSC films on YSZ and on La0.95Sr0.05Ga0.95Mg0.05O3-? (LSGM) single crystals exhibit significantly different electrochemical properties, possibly associated with the tensile strain of LSC on LSGM.

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Fluctuation induced conductivity and pseudogap state studies of Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_10+? superconductor added with ZnO nanoparticles.

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Fluctuation induced conductivity and pseudogap state studies of Bi<sub>1.6</sub>Pb<sub>0.4</sub>Sr<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>10+δ</sub> superconductor added with ZnO nanoparticles.

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

Publications

Fluctuation induced conductivity and pseudogap state studies of Bi<sub>1.6</sub>Pb<sub>0.4</sub>Sr<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>10+δ</sub> superconductor added with ZnO nanoparticles.

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OmicsDI is part of the ELIXIR infrastructure

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Fluctuation induced conductivity and pseudogap state studies of Bi_1.6Pb_0.4Sr₂Ca₂Cu₃O_10+? superconductor added with ZnO nanoparticles.