Preparation and Flux-Pinning Properties of Multilayered Yttrium Barium Copper Oxide Thin Films Containing Alternating Barium Zirconate and Yttria Nanostructures

Liu, Yu; Du, Guoping

doi:10.1007/s11664-011-1657-2

Cited by 13 publications

(5 citation statements)

References 28 publications

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“…Because of their structure, the segmented nanorods can act as more diverse pinning centres than rods penetrating through the whole sample. Despite the promising results in multilayers, to our knowledge only Liu and Du 18 have utilized the pinning possibilities of the spacer layer between the nanorod layers.…”

Section: Introductionmentioning

confidence: 99%

Enhanced flux pinning in YBCO multilayer films with BCO nanodots and segmented BZO nanorods

Malmivirta

Rijckaert

Paasonen

et al. 2017

Sci Rep

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The flux pinning properties of the high temperature superconductor YBa2Cu3O7−δ (YBCO) have been conventionally improved by creating both columnar and dot-like pinning centres into the YBCO matrix. To study the effects of differently doped multilayer structures on pinning, several samples consisting of a multiple number of individually BaZrO3 (BZO) and BaCeO3 (BCO) doped YBCO layers were fabricated. In the YBCO matrix, BZO forms columnar and BCO dot-like defects. The multilayer structure improves pinning capability throughout the whole angular range, giving rise to a high critical current density, J c. However, the BZO doped monolayer reference still has the most isotropic J c. Even though BZO forms nanorods, in this work the samples with multiple thin layers do not exhibit a c axis peak in the angular dependence of J c. The angular dependencies and the approximately correct magnitude of J c were also verified using a molecular dynamics simulation.

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Section: Introductionmentioning

confidence: 99%

Enhanced flux pinning in YBCO multilayer films with BCO nanodots and segmented BZO nanorods

Malmivirta

Rijckaert

Paasonen

et al. 2017

Sci Rep

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“…Liu utilized a 1.5 vol. % BZO and YBCO target to produce films on LAO decorated with Y2O3 nano-islands [5]. Optimization of film thickness for films consisting of YBCO with BZO and Y2O3 has also been studied, utilizing a 5 mol.…”

mentioning

confidence: 99%

Comparison study of the flux pinning enhancement of YBCO superconductor with BZO and BZO + Y₂O₃ mixed phase additions

Sebastian

Ebbing

Zhang

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Adding nanophase defects to YBa2Cu3O7-δ (YBCO) superconductor thin films is wellknown to enhance flux pinning, resulting in an increase in current density (Jct). While many previous studies focused on single phase additions, the addition of several phases simultaneously shows promise in improving current density by combining different pinning mechanisms. This paper compares the effect of the addition of two insulating, nonreactive phases of barium zirconium oxide (BZO) and yttrium oxide Y2O3, both as a single addition of BZO and as a double addition in conjunction with Y2O3. Processing parameters vary the target composition volume percent of BZO from 2-6 vol. %, while maintaining 3 vol. % Y2O3, and the remaining vol. % YBCO. Pulsed laser deposition produced thin films on LaAlO3 (LAO) and SrTiO3 (STO) substrates at various deposition temperatures. Comparison of strong and weak flux pinning mechanisms, current densities, critical temperatures, and microstructures of the resulting films will be presented. Films produced from the 2 vol. % BZO + 3 vol. Y2O3 doped YBCO target at a deposition temperature of 825 °C attained the highest current density. The addition of second phase Y2O3 impacted the film microstructure, resulting in more isotropic behavior when compared to the YBCO films doped with only BZO. . Liu utilized a 1.5 vol. % BZO and YBCO target to produce films on LAO decorated with Y2O3 nano-islands [5]. Optimization of film thickness for films consisting of YBCO with BZO and Y2O3 has also been studied, utilizing a 5 mol. % BZO and 5 mol. % Y2O3 target [6]. It is hypothesized that the combination of BZO and Y2O3 with YBCO influences the lattice strain in the film. This research seeks to explore the effects on current density of doping a YBCO target with 2, 4, and 6 volume percent BZO along with 3 vol. percent Y2O3, with the remaining volume percent YBCO.

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“…Notably, various multilayered structures, such as YBCO/YBCO-BZO [16][17][18], YBCO-BZO/YBCO-Y 2 O 3 [19], Y 2 O 3 /YBCO [20], YBCO-BZO/ CeO 2 [17,18], YBCO-BZO /YBCO-BaSnO 3 [21], YBCO-BZO /YBCO-BaCeO 3 [22], YBCO-4wt%BZO / YBCO-12wt%BZO [23] and various other combinations [24] have demonstrated substantial improvements in YBCO microstructure, current-carrying capabilities, and pinning in YBCO films of larger thickness, offering one solution to produce the high enough J c level. In addition, thin seed layers have been used to improve the growth of the YBCO layer.…”

Section: Introductionmentioning

confidence: 99%

Enhanced current-carrying capability in YBCO coated conductor bilayers for high-field applications

Aye,

Rivasto,

Zhao

et al. 2024

Phys. Scr.

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We have investigated the impact of bilayer structures on the critical current density, J c, of YBa2Cu3O6+x (YBCO) coated conductor films, i.e. films grown on buffered metal substrates, under varying temperature and magnetic field conditions. The bilayers consisted of a YBCO layer free of artificial pinning centers and 8 wt% BaZrO3-added (BZO) layer on top, where the thickness percentage of the layers was varied from 0 to 100 %. The results reveal that the bilayer configuration enhances J c at temperatures below 60 K, with a significant improvement in high magnetic fields (5–8 T) and temperatures ≤20 K. The optimal BZO-added layer thickness was found to be approximately 70 %, reaching 80 % at 8 T. Structural examinations indicate improved growth of YBCO and BZO nanorods in the bilayer structure with BZO-added layer thickness ≤80 %. Theoretical model of the bilayer structure considering the layers as two parallel superconductors with different properties was developed. It was found that the model adequately explains all the experimentally observed tendencies, and thus the observed maximum in J c is due to better growth of the BZO-added layer. The study provides valuable insights for designing optimal bilayer structures for diverse applications operating in different temperature and magnetic field regimes.

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Preparation and Flux-Pinning Properties of Multilayered Yttrium Barium Copper Oxide Thin Films Containing Alternating Barium Zirconate and Yttria Nanostructures

Cited by 13 publications

References 28 publications

Enhanced flux pinning in YBCO multilayer films with BCO nanodots and segmented BZO nanorods

Enhanced flux pinning in YBCO multilayer films with BCO nanodots and segmented BZO nanorods

Comparison study of the flux pinning enhancement of YBCO superconductor with BZO and BZO + Y₂O₃ mixed phase additions

Enhanced current-carrying capability in YBCO coated conductor bilayers for high-field applications

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Preparation and Flux-Pinning Properties of Multilayered Yttrium Barium Copper Oxide Thin Films Containing Alternating Barium Zirconate and Yttria Nanostructures

Cited by 13 publications

References 28 publications

Enhanced flux pinning in YBCO multilayer films with BCO nanodots and segmented BZO nanorods

Enhanced flux pinning in YBCO multilayer films with BCO nanodots and segmented BZO nanorods

Comparison study of the flux pinning enhancement of YBCO superconductor with BZO and BZO + Y2O3 mixed phase additions

Enhanced current-carrying capability in YBCO coated conductor bilayers for high-field applications

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Comparison study of the flux pinning enhancement of YBCO superconductor with BZO and BZO + Y₂O₃ mixed phase additions