Structural and superconducting characteristics of YBa2Cu3O7 films grown by fluorine-free metal-organic deposition route

Abstract

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Development of a Fluorine-Free Polymer-Assisted-Deposition Route for YBa2Cu3O7−x Superconducting Films

“…For all three samples ΔT was situated in a narrow, 2-2.1 K, interval. The determined Tc values and transition widths are in good agreement with those reported for other PAD/CSD YBCO films [12,20,21]. Cation disorder present in the strained films pyrolyzed at lower temperatures determine a reduction of Tc [30].…”

“…In the high temperature regime, the sample heat treated at 550 °C has the highest Jc value. Also, the as reported values of Jc, are comparable with the values reported in other PAD/CSD grown layers [12,20,21]. To further investigate this behavior a fit of the Jc(T) dependencies was performed.…”

“…However, one of the major drawbacks of this method is the liberation of toxic HF during the YBCO pyrolysis/crystallization steps [5]. Continuous efforts are being carried out in the development of low-fluorine (see for example [6,7]) and fluorine-free chemical solution deposition processes [8][9][10][11][12]. These approaches consist of dissolving carboxylates, such as acetates, propionates, etc., or β-diketonates, as metal precursors in a common solvent, usually organic acids, and combining the solutions to yield the desired stoichiometry.…”

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

“…The surfaces of the top YBCO layer of the four samples SS, SIS-20, SIS-40, and SIS-70 were observed, as shown in Figure 5. Since the lattice constant of YBCO in the c-axis direction is approximately three times longer than that in the a-axis (or b-axis) direction, usually the a-(b-) axis grains at the surface are needle-like or strip-shaped, while the c-axis grains are columnar through the film [8]. It can be seen from Figure 5 that although the SS sample had many holes on the surface, there were no needle-like or strip-shaped a-axis grains, and almost all of them were columnar c-axis grains.…”

“…YBa 2 Cu 3 O 7−x (YBCO)-coated conductors with high current-carrying capacity at liquid nitrogen temperature are currently thought to be the best candidates for power application 1 [1][2][3][4][5]. It is well known, however, that the critical current density (J c ) of YBCO-coated conductors or films decay exponentially with an applied magnetic field [6][7][8]. For practical application, enhancement of J c in magnetic fields is urgently needed in order to produce higher-performance coated conductors or films.…”