Strong pinning in very fast grown reactive co-evaporated GdBa2Cu3O7 coated conductors

MacManus‐Driscoll, Judith L.; Bianchetti, Marco; Kuršumović, A.; Kim, G.; Jo, William; Wang, H.; Lee, J. H.; Hong, Gye-Won; Moon, S.H.

doi:10.1063/1.4893339

Cited by 36 publications

(38 citation statements)

References 21 publications

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“…In this case, fast atomic diffusion and high atomic density encompass a much higher growth rate than in vapor or solid diffusion reaction approaches 12 . More recently, few examples of liquid-assisted growth of REBCO films are found, all based on vacuum deposition techniques 10,11,[13][14][15][16] .…”

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confidence: 99%

Ultrafast transient liquid assisted growth of high current density superconducting films

et al. 2020

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The achievement of high growth rates in YBa 2 Cu 3 O 7 epitaxial high-temperature superconducting films has become strategic to enable high-throughput manufacturing of long length coated conductors for energy and large magnet applications. We report on a transient liquid assisted growth process capable of achieving ultrafast growth rates (100 nm s −1) and high critical current densities (5 MA cm −2 at 77 K). This is based on the kinetic preference of Ba-Cu-O to form transient liquids prior to crystalline thermodynamic equilibrium phases, and as such is a non-equilibrium approach. The transient liquid-assisted growth process is combined with chemical solution deposition, proposing a scalable method for superconducting tapes manufacturing. Additionally, using colloidal solutions, the growth process is extended towards fabrication of nanocomposite films for enhanced superconducting properties at high magnetic fields. Fast acquisition in situ synchrotron X-ray diffraction and high resolution scanning transmission electron microscopy (STEM) become crucial measurements in disentangling key aspects of the growth process.

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confidence: 99%

Ultrafast transient liquid assisted growth of high current density superconducting films

et al. 2020

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“…This indicates that the fabricated film is flatter and steadier than that produced using the single-path fabrication process [14]. However, the GdBCO films were produced using a RCE-DR process, which has a single path on the stability diagram [12]. From the difference the shape of defects in LTBM images, we suppose that the different processes might be affected to develop different kind of defects.…”

Section: Resultsmentioning

confidence: 86%

“…The micro-bridge surface had an area of 150 m 1000 m; however, its actual size was 172 m  1030 m due to over etching. We observe the surface structure of solidified flux as fast conversion from liquid phases to on Gd123 phases [12]. In addition, the size of the granules on the surface and the intensity can be estimated from the voltage signal.…”

Section: Resultsmentioning

confidence: 99%

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Local transport properties of coated conductors by laser-scan imaging methods

Kim¹,

Jo²,

Nam³

et al. 2016

Progress in Superconductivity and Cryogenics

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To observe the superconducting current and structural properties of high critical temperature (T c ) superconductors (HTS), we suggest the following imaging methods: Room temperature imaging (RTI) through thermal heating, low-temperature bolometric microscopy (LTBM) and Raman scattering imaging. RTI and LTBM images visualize thermal-electric voltages as different thermal gradients at room temperature (RT) and superconducting current dissipation at near-T c , respectively. Using RTI, we can obtain structural information about the surface uniformity and positions of impurities. LTBM images show the flux flow in two dimensions as a function of the local critical currents. Raman imaging is transformed from Raman survey spectra in particular areas, and the Raman vibration modes can be combined. Raman imaging can quantify the vibration modes of the areas. Therefore, we demonstrate the spatial transport properties of superconducting materials by combining the results. In addition, this enables visualization of the effect of current flow on the distribution of impurities in a uniform superconducting crystalline material. These imaging methods facilitate direct examination of the local properties of superconducting materials and wires.

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“…On the other hand, the PLD process used in this work for preparing the mother heteroepitaxial nanocomposite films is not scalable. In this context, epitaxial materials can be prepared nowadays by scalable, industrial crystal growth routes such as reactive co‐evaporation . A mother nanocomposite film can be prepared in a similar manner.…”

Section: Resultsmentioning

confidence: 99%

Nanoporous Films and Nanostructure Arrays Created by Selective Dissolution of Water‐Soluble Materials

et al. 2018

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Highly porous thin films and nanostructure arrays are created by a simple process of selective dissolution of a water‐soluble material, Sr3Al2O6. Heteroepitaxial nanocomposite films with self‐separated phases of a target material and Sr3Al2O6 are first prepared by physical vapor deposition. NiO, ZnO, and Ni1− xMgxO are used as the target materials. Only the Sr3Al2O6 phase in each nanocomposite film is selectively dissolved by dipping the film in water for 30 s at room temperature. This gentle and fast method minimizes damage to the remaining target materials and side reactions that can generate impurity phases. The morphologies and dimensions of the pores and nanostructures are controlled by the relative wettability of the separated phases on the growth substrates. The supercapacitor properties of the porous NiO films are enhanced compared to plain NiO films. The method can also be used to prepare porous films or nanostructure arrays of other oxides, metals, chalcogenides, and nitrides, as well as films or nanostructures with single‐crystalline, polycrystalline, or amorphous nature.

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Strong pinning in very fast grown reactive co-evaporated GdBa2Cu3O7 coated conductors

Cited by 36 publications

References 21 publications

Ultrafast transient liquid assisted growth of high current density superconducting films

Ultrafast transient liquid assisted growth of high current density superconducting films

Local transport properties of coated conductors by laser-scan imaging methods

Nanoporous Films and Nanostructure Arrays Created by Selective Dissolution of Water‐Soluble Materials

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