Fabrication and Characterization of YBCO Thin Film Co-doped with BYNO + LAO Nanoparticles
- PDF / 1,733,983 Bytes
- 7 Pages / 595.276 x 790.866 pts Page_size
- 107 Downloads / 181 Views
ORIGINAL PAPER
Fabrication and Characterization of YBCO Thin Film Co-doped with BYNO + LAO Nanoparticles Yu-Qi Zhou 1 & Hong-Li Suo 1 & Ya Wang 1 & Kausar Shaheen 1 & Min Liu 1 & Lin Ma 1 & Lei Wang 2 & Zi-Li Zhang 2 Received: 2 April 2020 / Accepted: 4 August 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract This study aims to enhance the critical current density (Jc) of a YBa2Cu3O7-x (YBCO) film by adding more pinning centers and reducing defects. Perovskite nanomaterials with positive and negative mismatch lattices with respect to YBCO were simultaneously doped on a YBCO film using a low-fluorine metal organic deposition technique. The co-doping with both positive and negative mismatch dopant was revealed to be effective at up to 10%, as compared with the previously reported amount for single nanoparticles (i.e., 7%). At doping levels of 8 mol% Ba2YNbO6 (positively mismatch perovskite) and 2 mol% LaAlO3 (negatively mismatch perovskite), the surface of the film was observed to be flat and dense with an improved critical current density and pinning force. The positive and negative mismatched lattice eliminated the long-range strains and introduced crystal defects; thus, the pinning centers became more effective. This study describes a feasible approach regarding the positive-negative mismatch theory by providing an optimal design for the effective pinning centers of a YBCO film. This approach can open a gateway for advanced applications of second-generation high-temperature coated conductors at the industrial level. Keywords Positive and negative lattice mismatch . Nanoparticles . Co-doping . Pinning force
1 Introduction High-temperature superconducting materials such as REBa2Cu3O7-x (REBCO) have achieved remarkable importance owing to their high irreversibility field (Hirr), strong current carrying capacity, and low AC loss. Since the initial discovery of YBa2Cu3O7-x (REBCO) in 1989, research into superconducting materials has entered a new era [1–5]. Various theoretical and experimental approaches have improved the current transport capacity and Jc of YBCO. One of the most effective methods is the introduction of nanoparticles with an appropriate size as the pinning center [6, 7]. For example, researchers at Kyushu University have improved the Jc for YBCO films doped with BZO by changing the holding time of the nucleation temperature zone [8]. However, * Hong-Li Suo [email protected] * Zi-Li Zhang [email protected] 1
Beijing University of Technology, Beijing 100124, China
2
Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
exceeding the doping amount for a single nanoparticle beyond 7–8% can damage the texture, and thereby the superconducting performance of a thin film [9–12]. Effective nanoparticles with advanced doping materials have recently become the main interest of numerous researchers. For example, a multi-doped mixed pinning technique is greatly favored owing to the fact that it has overcome many limitations caused
Data Loading...
