A1 Refereed original research article in a scientific journal
Optimization of high-temperature superconducting bilayer structures using a vortex dynamics simulation
Authors: Rivasto Elmeri, Hynninen Teemu, Huhtinen Hannu, Paturi Petriina
Publisher: IOP Publishing Ltd
Publication year: 2023
Journal: Journal of Physics: Condensed Matter
Journal name in source: JOURNAL OF PHYSICS-CONDENSED MATTER
Journal acronym: J PHYS-CONDENS MAT
Article number: 075701
Volume: 35
Issue: 7
Number of pages: 10
ISSN: 0953-8984
eISSN: 1361-648X
DOI: https://doi.org/10.1088/1361-648X/ac9f97
Web address : https://iopscience.iop.org/article/10.1088/1361-648X/ac9f97
Abstract
We argue that the current carrying properties of high-temperature superconducting thin films can be further improved, in particular under the mid-field range (B asymptotic to 0.1-2 T), via introduction of multilayer structures that compromise between good zero field critical current and vortex pinning performance. In this work we focus on a simple bilayer structure consisting of two adjacent layers of pure YBa2Cu3O6+x (YBCO) and BaZrO3 (BZO) doped YBCO under magnetic field within the mid-field range oriented parallel to the c-axis of the YBCO unit cell. We have utilized a computational model to simulate the vortex dynamics limited critical current separately from the associated zero field current, which is addressed analytically. The obtained results have allowed us to estimate the optimal layer thicknesses as a function of magnetic field. Our idealized model suggests that the thickness of the doped layer should be substantially smaller than the undoped one, that is around 30% of the total thickness of the film. We have estimated that the current carrying capability of the optimized bilayer structure can be up to 50% higher when compared with corresponding single layer films. Possible deviations from the obtained results associated with the idealized model, most prominently the effect of natural defects, are comprehensively discussed. Our results provide the foundation for the future experimental realization of the proposed bilayer structures. The comparison between the presented results and experimental realization would enable further study of the underlying primitive vortex interactions.
We argue that the current carrying properties of high-temperature superconducting thin films can be further improved, in particular under the mid-field range (B asymptotic to 0.1-2 T), via introduction of multilayer structures that compromise between good zero field critical current and vortex pinning performance. In this work we focus on a simple bilayer structure consisting of two adjacent layers of pure YBa2Cu3O6+x (YBCO) and BaZrO3 (BZO) doped YBCO under magnetic field within the mid-field range oriented parallel to the c-axis of the YBCO unit cell. We have utilized a computational model to simulate the vortex dynamics limited critical current separately from the associated zero field current, which is addressed analytically. The obtained results have allowed us to estimate the optimal layer thicknesses as a function of magnetic field. Our idealized model suggests that the thickness of the doped layer should be substantially smaller than the undoped one, that is around 30% of the total thickness of the film. We have estimated that the current carrying capability of the optimized bilayer structure can be up to 50% higher when compared with corresponding single layer films. Possible deviations from the obtained results associated with the idealized model, most prominently the effect of natural defects, are comprehensively discussed. Our results provide the foundation for the future experimental realization of the proposed bilayer structures. The comparison between the presented results and experimental realization would enable further study of the underlying primitive vortex interactions.
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