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Enhancement of Critical Current Density by Establishing a YBa2Cu3O7?x/LaAlO3/YBa2Cu3O7?x Quasi-Trilayer Architecture Using the Sol-Gel Method
Open AccessArticle

Superconducting HfO2-YBa2Cu3O7?δ Nanocomposite Films Deposited Using Ink-Jet Printing of Colloidal Solutions

1
Department of Chemistry, Sol-Gel Centre for Research on Inorganic Powders and Thin Films Synthesis (SCRiPTS), Ghent University, Krijgslaan 281-S3, 9000 Ghent, Belgium
2
Karlsruhe Institute of Technology, Institute for Technical Physics, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(1), 17; https://doi.org/10.3390/coatings10010017
Received: 20 November 2019 / Revised: 22 December 2019 / Accepted: 24 December 2019 / Published: 26 December 2019
(This article belongs to the Special Issue Superconducting Films and Nanostructures)
To reduce the fabrication costs while maximizing the superconducting and pinning properties of YBa2Cu3O7−δ (YBCO) nanocomposite films, the drop-on-demand ink-jet printing technique was used to deposit colloidal YBCO inks onto LaAlO3 substrates. These inks containing preformed HfO2 nanocrystals were carefully adjusted, prior to the jettability, as the droplet formation depends on the rheological properties of the inks themselves. After carefully adjusting printing parameters, 450-nm thick pristine YBCO films with a self-field critical current density (Jc) of 2.7 MA cm² at 77 K and 500-nm thick HfO2-YBCO nanocomposite films with a self-field Jc of 3.1 MA·cm² at 77 K were achieved. The final HfO2-YBCO nanocomposite films contained dispersed BaHfO3 particles in a YBCO matrix due to the Ba2+ reactivity with the HfO2 nanocrystals. These nanocomposite films presented a more gradual decrease of Jc with the increased magnetic field. These nanocomposite films also showed higher pinning force densities than the pristine films. This pinning enhancement was related to the favorable size and distribution of the BaHfO3 particles in the YBCO matrix. View Full-Text
Keywords: chemical solution deposition; ink-jet printing; nanocomposite; nanoparticles; superconductor; thin film; YBCO chemical solution deposition; ink-jet printing; nanocomposite; nanoparticles; superconductor; thin film; YBCO
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Rijckaert, H.; Cayado, P.; Nast, R.; Diez Sierra, J.; Erbe, M.; López Dominguez, P.; H?nisch, J.; De Buysser, K.; Holzapfel, B.; Van Driessche, I. Superconducting HfO2-YBa2Cu3O7?δ Nanocomposite Films Deposited Using Ink-Jet Printing of Colloidal Solutions. Coatings 2020, 10, 17.

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