Reducing thickness dependence of critical current density in GdBa2Cu3O7-δ thin films by addition of nanostructured defects

Tran, Duc H.; Putri, W. B. K.; Kang, Byeongwon; Lee, N. H.; Kang, Won Nam; Seong, Won Kyung

doi:10.1063/1.4798233

Cited by 12 publications

(8 citation statements)

References 15 publications

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“…The thickness dependence of J c for our IBS CCs is quite different from that in cuprate superconductors. It has been found that the J c - t behavior in cuprate superconductors can be addressed by collective pinning theory, by which the J c reduction with increasing thickness can be well described as J c ∼ t −1/2 , followed by a crossover thickness t c , over which J c becomes almost thickness independent ( Wang and Wu, 2007 ; Tran et al., 2013 ; Gurevich, 2007 ). It is interesting to note that the thinnest films with the lowest T c showed the highest J c up to 5 T for H//c and 9 T for H//ab .…”

Section: Resultsmentioning

confidence: 99%

Thickness dependence of structural and superconducting properties of Co-doped BaFe2As2 coated conductors

Dong

Cai

et al. 2021

iScience

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Summary High-quality Co-doped BaFe 2 As 2 thin films with thickness up to 2 μm were realized on flexible metal tapes with LaMnO 3 as buffer layers fabricated by an ion beam-assisted deposition technique. Structural analysis indicates that increasing thickness does not compromise the film crystallinity, except for a small amount of impurities. Two types of thickness dependence of critical current density ( J c ) were found: one is almost thickness independent in the range of 0.6–1.5 μm and the other is highly thickness dependent. In addition, the maximum value for crucial current I c at 9 T and 4.2 K is about 55 A/12 mm-W for the 1.5-μm-thick film. Anisotropic Ginzburg–Landau scaling demonstrates that dominant pinning centers develop from correlated to uncorrelated with increasing film thickness. The further theoretical analysis shows that with film thickness increasing the pinning mechanism evolves progressively from a δl pinning to the δT c pinning mechanism.

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Section: Resultsmentioning

confidence: 99%

Thickness dependence of structural and superconducting properties of Co-doped BaFe2As2 coated conductors

Dong

Cai

et al. 2021

iScience

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“…As the drive for performance and complexity of electronic and optical devices increases, new materials with novel functionalities and multifunctionalities are highly desired [1,2]. Nanocomposite thin film materials and nanoparticles are considered some of the most promising options given their advantages in both size and physical property tunability when compared to traditional single phase films [3][4][5][6][7][8][9][10]. Nanocomposite thin film materials consist of three main different nanostructure types: multilayers, nanoparticles-in-matrix, and vertically aligned nanocomposites (VANs) [3,9].…”

Section: Introductionmentioning

confidence: 99%

Single-Step Fabrication of Au-Fe-BaTiO3 Nanocomposite Thin Films Embedded with Non-Equilibrium Au-Fe Alloyed Nanostructures

et al. 2022

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Nanocomposite thin film materials present great opportunities in coupling materials and functionalities in unique nanostructures including nanoparticles-in-matrix, vertically aligned nanocomposites (VANs), and nanolayers. Interestingly the nanocomposites processed through a non-equilibrium processing method, e.g., pulsed laser deposition (PLD), often possess unique metastable phases and microstructures that could not achieve using equilibrium techniques, and thus lead to novel physical properties. In this work, a unique three-phase system composed of BaTiO3 (BTO), with two immiscible metals, Au and Fe, is demonstrated. By adjusting the deposition laser frequency from 2 Hz to 10 Hz, the phase and morphology of Au and Fe nanoparticles in BTO matrix vary from separated Au and Fe nanoparticles to well-mixed Au-Fe alloy pillars. This is attributed to the non-equilibrium process of PLD and the limited diffusion under high laser frequency (e.g., 10 Hz). The magnetic and optical properties are effectively tuned based on the morphology variation. This work demonstrates the stabilization of non-equilibrium alloy structures in the VAN form and allows for the exploration of new non-equilibrium materials systems and their properties that could not be easily achieved through traditional equilibrium methods.

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“…A/cm-w から 124.7A/cm-w(77 K, 1 T)に向上した。 Fig. 16 Field dependence of Ic in a 3.0 m-thick, BHO-doped YBCO film.…”

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Thickening of YBa2Cu3Oy-coated Conductors Fabricated by Self-heating Technique Using Pulsed Laser Deposition Method and Superconducting Properties in Magnetic Field

2020

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We fabricated YBa2Cu3Oy (YBCO)coated conductors (CCs) 0.4 -8.6 μm in thickness on Hastelloy metal substrates with oxide-textured layers, including IBAD-MgO, which were heated by a self-heating technique (SHT) using the pulsed laser deposition method. The substrate temperature (Ts) measured with a thermocouple or pyrometer was feedback-controlled (FBC) during deposition. It was possible to suppress a-axis grains even in a thick when using the SHT. The critical current (Ic) of the YBCO CCs with a thickness of 4.9 μm reached 1080 A/cm-w at 77 K and in a self-field. In addition, 3.0 -9.0 vol.%BHO-doped YBCO CCs with a thickness of 3.0 μm were fabricated using pyrometer FBC. The Ic in a magnetic field at 77 K was optimized by adding 3.0 vol.%BHO.

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Reducing thickness dependence of critical current density in GdBa2Cu3O7-δ thin films by addition of nanostructured defects

Cited by 12 publications

References 15 publications

Thickness dependence of structural and superconducting properties of Co-doped BaFe2As2 coated conductors

Thickness dependence of structural and superconducting properties of Co-doped BaFe2As2 coated conductors

Single-Step Fabrication of Au-Fe-BaTiO3 Nanocomposite Thin Films Embedded with Non-Equilibrium Au-Fe Alloyed Nanostructures

Thickening of YBa<sub>2</sub>Cu<sub>3</sub>O<i><sub>y</sub></i>-coated Conductors Fabricated by Self-heating Technique Using Pulsed Laser Deposition Method and Superconducting Properties in Magnetic Field

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