Accelerated growth by flash heating of high critical current trifluoroacetate solution derived epitaxial superconducting YBa₂Cu₃O₇ films

Abstract

Flash heating reduces the precursor nanoparticle coarsening and shortens the growth time of epitaxial YBa2Cu3O7 thin films.

Low-Fluorine Ba-Deficient Solutions for High-Performance Superconducting YBCO Films

“…Further analysis of angular Jc dependences in conjunction with an advanced TEM microstructural analysis should be performed in order to elucidate the nature of pinning centers. However, considering the results obtained in other CSD films and nanocomposites studied, an enhancement of µ0H* and isotropic strong pinning contribution can be correlated with the presence of stacking faults and associated nanostrain [29,30,45,46]. Figure 7b shows the µ 0 H* values obtained for the different films as a function of T g .…”

“…In the case of FH films, although a slight enhancement of µ0H* is observed at low Tg, a clear tendency cannot be identified. For those samples, the value of µ0H* is already very high at Tg = 810 °C, thus pointing out that the higher nucleation rate of FH process also helps to induce pinning defects within the matrix, which are not present with CTA growth [30]. The effect of rapid annealing on the defect structure and final properties of different functional materials has also been reported [40,41].…”

“…The growth processes were carried out through two different methods: conventional thermal annealing (CTA) [27] and flash heating (FH) [28][29][30]. The idea was to study the influence of the heating ramp in the pinning landscape originating within the films and, therefore, in the final superconducting properties.…”

Embedded Magnetism in YBa2Cu3O7 Associated with Cu–O Vacancies within Nanoscale Intergrowths: Implications for Superconducting Current Performance

“…The obtained histograms evidence that the concentration of short Y124 intergrowths (length <50 nm) is enhanced with respect to pristine films, where only a smaller number of long intergrowths (length >150 nm), principally located at the surface are formed 14 ; NCs grown using an extremely fast, flux-heating process present an even higher population of shorter (<20 nm) SF's. 20 The SF's induced in the NC by the presence of nanoparticles appear extremely rippled (Figure 2e). We analyzed as well a second YBCO+10% BYTO NC, with a similar intergrowth population, but des-oxygenated after growth, noted NC(des-ox), so as to analyze the effects on defect-driven embedded magnetism.…”

Suppression of superconductivity at the nanoscale in chemical solution derived YBa2Cu3O7−δthin films with defective Y2Ba4Cu8O16intergrowths

“…10,24 Particularly, in CSD nanocomposites it has been shown that vortex pinning is strongly enhanced by the concentration of these Y248 intergrowths. 9,10,25 The structure of the planar Y248 intergrowth defects has been recently analyzed in detail by Scanning Transmission Electron Microscopy (STEM). The expected composition of the Y248 intergrowth is Y 2 Ba 4 Cu 8 O 16 because they consist on an extra Cu-O chain layer inserted between two Ba-O layers, leading to a lattice expansion in c-axis direction (from 11.7 to 13.3Å).…”