Abstract
Co-precipitation method and conventional solid-state reaction technique were used to synthesize BaSnO3 nanoparticles and (BaSnO3)x/Bi1.6Pb0.4Sr2Ca2Cu3O10+δ (0 ≤ x ≤ 1.50 wt%) samples, respectively. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and electrical resistivity data were used to characterize BiPb-2223 phase added by BaSnO3 nanoparticles. The relative volume fraction and superconducting transition temperature Tc of BiPb-2223 phase were enhanced by increasing BaSnO3 addition up to 0.50 wt%. These parameters were decreased with further increase of x. The resistive transition broadening under different applied DC magnetic fields (0.29–4.40 kG) was analyzed through thermally activated flux creep (TAFC) model and Ambegaokar–Halperin (AH) theory. Improvements of the derived flux pinning energy U, critical current density Jc (0) estimated from AH parameter C(B), and upper critical magnetic field Bc2 (0), were recorded by adding BaSnO3 nanoparticles up to 0.50 wt%, beyond which these parameters were suppressed. The magnetic field dependence of the flux pinning energy and critical current density decreased as a power-law relation, which indicated the single junction sensitivity between the superconducting grains to the applied magnetic field. Furthermore, the increase in the applied magnetic field did not affect the electronic thermal conductivity κe above the superconducting transition temperature and suppressed it below Tc.
Highlights
IntroductionAmbegaokar and Halperin’s theory is another approach to study the flux line motion under applied magnetic field [29]
Three phases are included in Bi-based superconductors with general formula Bi2Sr2Can 1CunO2n+4+δ (n = 1, 2, 3)
It was reported that the improvements of both flux pinning and Jc are achieved by the addition of various oxide nanoparticles, such as ZrO2 [7], Al2O3 [8], SnO2 [9], ZnO [10], Cr2O3 [11], and NiFe2O4 [12], into the selected BiPb-2223 phase
Summary
Ambegaokar and Halperin’s theory is another approach to study the flux line motion under applied magnetic field [29] This theory describes the thermal fluctuation effect on the phase of the order parameter across a current-driven Josephson junction [30]. BaSnO3 nanoparticles of different weight percentages were added into BiPb-2223 phase in an attempt to create pinning centers that enhance flux pinning. For such purpose, a series of (BaSnO3)x / Bi1.6Pb0.4Sr2Ca2Cu3O10+δ (0 ≤ x ≤ 1.50 wt%) samples were prepared by using conventional solid-state reaction technique. Several superconducting parameters were calculated for BiPb-2223 phase as a function of BaSnO3 nanoparticle addition
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have