Strong flux pinning centers in Y-Ba-Cu-O films prepared by chemical vapor deposition

Watanabe, Kazuo; Matsushita, Teruo; Kobayashi, Norio; Kawabe, Hisashi; Aoyagi, Eiji; Hiraga, Kenji; Yamane, Hisanori; Kurosawa, Hideyuki; Hirai, Toshio; Muto, Yoshio

doi:10.1063/1.103211

Cited by 90 publications

(12 citation statements)

References 12 publications

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“…It is suggested that the grain growth takes place during sintering, and ABO 3 phase is dragged into the growing grain as the same species as the matrix because both phases have a similar crystal structure and have a semi-coherent interface as mentioned above. Several types of pinning centers like Y 2 BaCuO 5 [78], CuO [79], SnO 2 [80], ZrO 2 [81], and irradiation-induced defects [82] have been reported to be effective for the YBa 2 Cu 3 O 7-x superconductor [83][84][85][86][87]. A perovskite-type oxide, ABO 3 , seems to be a promising candidate as pinning center for the superconducting copper oxides because the crystal structure is similar to the host superconducting phase.…”

Section: Structures Of Y-based Copper Oxides With High J Cmentioning

confidence: 98%

High-resolution electron microscopy and electron diffraction of perovskite-type superconducting copper oxides

Oku

2014

Nanotechnology Reviews

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High-resolution electron microscopy and electron diffraction are quite useful for structural characterization of perovskite-type superconducting copper oxides on the atomic scale. Valuable information on the crystal structures and the microstructures could be obtained from observed high-resolution images if severe conditions such as thinner crystals and definite defocus values are satisfied. The structure images and electron diffraction patterns include information not only on accurate atomic coordinates of cations but also on ordered arrangements of oxygen atoms and oxygen vacancies. Crystal structures of the various perovskite-type copper oxides were analyzed from the observed structure images. Modulated structures, defects, intergowth, surfaces, and interfaces were also investigated.

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Section: Structures Of Y-based Copper Oxides With High J Cmentioning

confidence: 98%

High-resolution electron microscopy and electron diffraction of perovskite-type superconducting copper oxides

Oku

2014

Nanotechnology Reviews

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“…At high fields, a weak effect of point disorder on j s (B, T ) was demonstrated [44] in YBa 2 Cu 3 O 7−δ films after the introduction of point defects by low energetic (25 MeV) irradiation with 16 O ions. In our picture of linear defect pinning, above the characteristic field all linear defects pin one vortex and the additional vortices will be pinned by other defects [12].…”

Section: Pinning By Point Defects and Precipitatesmentioning

confidence: 99%

“…Although the details of the pinning mechanism operative at high fields are not clear to us at this moment, all results point to linear defects still being the effective pinning sites at B B * . Also a high density of precipitates facilitates vortex pinning [15][16][17], since a vortex can gain condensation energy. In the case of YBa 2 Cu 3 O 7−δ films mostly Y 2 O 3 precipitates have been found [46].…”

Section: Pinning By Point Defects and Precipitatesmentioning

confidence: 99%

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Feedback Coupling Module of Optical Transceiver Using Projection Core Fiber

Iima¹,

Tsukamoto²,

Fujita³

et al. 2006

jjap

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Although vortex pinning in laser-ablated YBa 2 Cu 3 O 7−δ films on (100) SrTiO 3 is dominated by threading dislocations Nature 399 439), many other natural pinning sites are present. To identify the contribution from twin planes, surface corrugations and point defects, we manipulate the relative densities of all defects by post-annealing films with various as-grown dislocation densities, n disl . While a universal magnetic field B dependence of the transport current density j s (B, T ) is observed (independently of n disl , temperature T and the annealing treatment), the defect structure changes considerably. Correlating the microstructure to j s (B, T ), it becomes clear that surface roughness, twins and point defects are not important at low magnetic fields compared to linear defect pinning. Transmission electron microscopy indicates that threading dislocations are not part of grain boundaries nor are they related to the twin domain structure. We conclude that j s (B, T ) is essentially determined by pinning along threading dislocations, naturally induced during the growth process. Even in high magnetic fields, where the vortex density outnumbers n disl , it appears that linear defects stabilize the vortex lattice by means of the vortex-vortex interaction.

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“…Simply put, pinning centers are non-superconducting regions, such as small impurities or crystal defects. Such pinning centers are crucial in the applications of superconductors as they can significantly influence critical parameters (most notably J c ) [ 20 , 21 , 22 ]. Typical parameters for the most important superconducting materials, their forms, and usual critical parameters are summarized in Table 1 .…”

Section: Introductionmentioning

confidence: 99%

Nanosized Pinning Centers in the Rare Earth-Barium-Copper-Oxide Thin-Film Superconductors

et al. 2020

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Since the discovery of high-temperature superconductivity, significant progress in the fabrication of REBCO-based (Rare Earth Barium Copper mixed Oxides) thin-films superconductors has been achieved. In our review, we described the approaches and possibilities of the improvement of superconducting properties by the introduction of nanosized pinning centers. We focused on the synthesis and viability of the material for artificial pinning centers and methods used for the introduction of the pinning centers into superconducting REBCO-based thin-films. This article summarizes available materials and procedures regardless of the financial cost of the individual method. According to available literature, the most significant superconducting REBCO tapes can be obtained when a combination of 1D and 0D nanoparticles are used for nanoscale pinning.

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Strong flux pinning centers in Y-Ba-Cu-O films prepared by chemical vapor deposition

Cited by 90 publications

References 12 publications

High-resolution electron microscopy and electron diffraction of perovskite-type superconducting copper oxides

High-resolution electron microscopy and electron diffraction of perovskite-type superconducting copper oxides

Feedback Coupling Module of Optical Transceiver Using Projection Core Fiber

Nanosized Pinning Centers in the Rare Earth-Barium-Copper-Oxide Thin-Film Superconductors

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