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Rivasto E, Aye MM, Huhtinen H, Paturi P. Enhanced critical current density in optimized high-temperature superconducting bilayer thin films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2023; 36:135702. [PMID: 38100827 DOI: 10.1088/1361-648x/ad162c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 12/15/2023] [Indexed: 12/17/2023]
Abstract
The superconducting and structural properties of bilayer thin films based on YBa2Cu3O7-x / YBa2Cu3O7-x+6%BaZrO3heterstructures have been studied. In a broad range of magnetic field strengths and temperatures, the optimal bilayer film comprises 30% YBCO at the substrate interface and 70% YBCO+6%BZO on the top. The critical current density measured for the optimal bilayer structure is shown to outperform the corresponding single layer films up to almost 60%. The obtained results are comprehensively discussed in the light of our previously published theoretical framework (Rivastoet al2023J. Phys.: Condens. Matter35075701:1-10). We conclude that the bilayering provides an efficient and easily applicable way to further increase the performance and applicability of high-temperature superconductors in various applications. Consequently, the bilayer films should be seriously considered as candidates for the upcoming generation of coated conductors.
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Affiliation(s)
- E Rivasto
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - M M Aye
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
- University of Turku Graduate School (UTUGS), University of Turku, FI-20014 Turku, Finland
| | - H Huhtinen
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
| | - P Paturi
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
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Rivasto E, Hynninen T, Huhtinen H, Paturi P. Optimization of high-temperature superconducting bilayer structures using a vortex dynamics simulation. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 35:075701. [PMID: 36322984 DOI: 10.1088/1361-648x/ac9f97] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Accepted: 11/02/2022] [Indexed: 06/16/2023]
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 ≈ 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 thec-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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Affiliation(s)
- E Rivasto
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
- University of Turku Graduate School (UTUGS), University of Turku, 20014 Turku, Finland
| | - T Hynninen
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
| | - H Huhtinen
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
| | - P Paturi
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
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Rivasto E, Huhtinen H, Hynninen T, Paturi P. Vortex dynamics simulation for pinning structure optimization in the applications of high-temperature superconductors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:235902. [PMID: 35294932 DOI: 10.1088/1361-648x/ac5e78] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 03/16/2022] [Indexed: 06/14/2023]
Abstract
We introduce a molecular dynamics based simulation model that enables the efficient optimization of complex pinning structures in unpresented wide magnetic field and angular ranges for high-temperature superconductor applications. The fully three-dimensional simulation allows the modeling of the critical current and the associated anisotropy in the presence of any kinds of defects despite their size and orientation. Most prominently, these include artificial defects such as nanorods along with intrinsic weak-links orab-plane oriented stacking faults, for example. In this work, we present and analyze the most fundamental results of the simulation model and compare them indirectly with a wide range of previous experimental and computational observations. With the provided validation for the proposed simulation model, we consider it to be an extremely useful tool in particular for pushing the limits of ampacity in the coated conductor industry.
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Affiliation(s)
- E Rivasto
- Department of Physics and Astronomy, Wihuri Physical Laboratory, University of Turku, 20014 Turku, Finland
- University of Turku Graduate School (UTUGS), University of Turku, 20014 Turku, Finland
| | - H Huhtinen
- Department of Physics and Astronomy, Wihuri Physical Laboratory, University of Turku, 20014 Turku, Finland
- University of Turku Graduate School (UTUGS), University of Turku, 20014 Turku, Finland
| | - T Hynninen
- Department of Physics and Astronomy, Wihuri Physical Laboratory, University of Turku, 20014 Turku, Finland
- University of Turku Graduate School (UTUGS), University of Turku, 20014 Turku, Finland
| | - P Paturi
- Department of Physics and Astronomy, Wihuri Physical Laboratory, University of Turku, 20014 Turku, Finland
- University of Turku Graduate School (UTUGS), University of Turku, 20014 Turku, Finland
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Aye MM, Rivasto E, Khan MZ, Rijckaert H, Salojärvi E, Haalisto C, Mäkilä E, Palonen H, Huhtinen H, Van Driessche I, Paturi P. Control of the nanosized defect network in superconducting thin films by target grain size. Sci Rep 2021; 11:6010. [PMID: 33727621 PMCID: PMC7966807 DOI: 10.1038/s41598-021-85304-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Accepted: 02/24/2021] [Indexed: 01/31/2023] Open
Abstract
A nanograined YBCO target, where a great number of grain boundaries, pores etc. exist, is shown to hold an alternative approach to future pulsed laser deposition based high-temperature superconductor thin film and coated conductor technologies. Although the nanograined material is introduced earlier, in this work, we comprehensively demonstrate the modified ablation process, together with unconventional nucleation and growth mechanisms that produces dramatically enhanced flux pinning properties. The results can be generalized to other complex magnetic oxides, where an increased number of defects are needed for modifying their magnetic and electrical properties, thus improving their usability in the future technological challenges.
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Affiliation(s)
- Moe Moe Aye
- grid.1374.10000 0001 2097 1371Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland ,grid.1374.10000 0001 2097 1371University of Turku Graduate School (UTUGS), University of Turku, 20014 Turku, Finland
| | - Elmeri Rivasto
- grid.1374.10000 0001 2097 1371Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland ,grid.1374.10000 0001 2097 1371University of Turku Graduate School (UTUGS), University of Turku, 20014 Turku, Finland
| | - Mukarram Zaman Khan
- grid.1374.10000 0001 2097 1371Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland ,grid.1374.10000 0001 2097 1371University of Turku Graduate School (UTUGS), University of Turku, 20014 Turku, Finland
| | - Hannes Rijckaert
- grid.5342.00000 0001 2069 7798SCRiPTS, Department of Chemistry, Ghent University, Krijgslaan 281 S3, 9000 Ghent, Belgium
| | - Esko Salojärvi
- grid.1374.10000 0001 2097 1371Inorganic Materials Chemistry, Department of Chemistry, University of Turku, 20014 Turku, Finland
| | - Christopher Haalisto
- grid.1374.10000 0001 2097 1371Materials Research Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
| | - Ermei Mäkilä
- grid.1374.10000 0001 2097 1371Laboratory of Industrial Physics, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
| | - Heikki Palonen
- grid.1374.10000 0001 2097 1371Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
| | - Hannu Huhtinen
- grid.1374.10000 0001 2097 1371Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
| | - Isabel Van Driessche
- grid.5342.00000 0001 2069 7798SCRiPTS, Department of Chemistry, Ghent University, Krijgslaan 281 S3, 9000 Ghent, Belgium
| | - Petriina Paturi
- grid.1374.10000 0001 2097 1371Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
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