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Showing 1 to 20 of 37 for “"YBa2Cu3O7"”.
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Strombegrenzende Mechanismen YBa2Cu3O7-[delta]-Dünnschichten und -Quasimultilagen
… and the maximum current carrying capability of YBa2Cu3O7-[delta] thin films and so called quasi-multilayers are investigated. These samples are prepared with pulsed laser deposition on single-crystalline substrates (SrTiO3) as well as on biaxially textured Ni tapes. The critical current density …
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Effets thermoélectrique et thermomagnétique du YBa2Cu3O7-[delta] monocristallin
Dès la découverte des supraconducteurs à haute température critique, les recherches se sont intensifiées afin de comprendre les mécanismes qui sont à l'origine des propriétés de ces matériaux. L'état mixte, tout comme l'état supraconducteur pur et l'état normal, a fait l'objet de nombreux travaux …
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Superior pinning properties in nano-engineered YBa2Cu3O7-δ
… segmented nanorods as well as nanoparticles in YBa2Cu3O7-δ thin films grown by pulsed laser deposition. The structural and morphological characteristic of the pinning landscapes produced are investigated and correlated to their effects on the superconducting properties of the thin films. In …
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The Properties of Grain Boundaries in YBa2Cu3O7-d
… to measure the normal state properties of YBa2Cu3O7-8 grain boundaries above the critical temperature. Since the resistance of the adjacent material at high temperatures is comparable to, or greater than that of the grain boundary, a compensating Wheatstone bridge structure was used. The …
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YBa2Cu3O7-x thin films prepared by Chemical Solution Deposition
… followed by Wu et al. [4, 5] who showed that YBa2Cu3O7−x (YBCO) becomes superconducting (92K) well above the boiling point of nitrogen (77K) created a great excitement in superconductivity research. Potential applications of high Tc-superconductors require large critical currents and …
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Chemisch deponierte Schichtsysteme zur Realisierung von YBa2Cu3O7−d-Bandleitern
… SrTiO3-Pufferschichten und supraleitender YBa2Cu3O7-Schichten.
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Nuclear resonance studies of the superconducting state of YBa2Cu3O7
Submitted by Carolyn Rauber (crauber2@illinois.edu) on 2012-01-20T22:35:03Z No. of bitstreams: 1 1993_martindale.pdf: 5380064 bytes, checksum: 4893b0ad106455429225a36167a26bbb (MD5)
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A thermogravimetric study of oxygen diffusion in YBa2Cu3O7-d
YBa2Cu3O7-d (YBCO) was one of the first high temperature superconductors discovered, and its superconducting properties are strongly dependent on oxygen stoichiometry. A large amount of work has been done on the variation of stoichiometry and its effect on the superconducting properties of the …
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Grain boundary networks in RABiTS based YBa2Cu3O7[-delta] coated conductors
… and critical current limitations found in YBa2Cu3O7[-delta] coated conductors prepared by the "rolling assisted biaxially textured substrate" (RABiTS) approach. For this purpose a buffer layer system composed of CeO2 and yttria-stabilised zirconia, and subsequently a …
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The Electronic Properties of Thin Film YBa2Cu3O7 Low Angle Grain Boundaries
… LAGBs formed by the thin film deposition of YBa2Cu3O7 onto bicrystalline substrates. Through the use of a precision two-axis goniometer, measurements of the V-I characteristic and critical current density were made as magnetic field was rotated in angles θ and φ relative to the LAGB defect. …
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Microstructural Development and Superconducting Parameters of the YBa2Cu3O7-delta Coated Conductor
A coated conductor is generally fabricated by depositing a high Tc superconducting layer onto a flexible metallic substrate, using intermediate buffer layers to prevent chemical interaction. In order for the superconductor to be capable of carrying a high current density, its grains must have good …
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Low Field Microwave Absorption in Nano-Magnetic Participle - incorporated YBa2Cu3O7-z Superconducting Materials
Understanding how and why superconductivity (SC) occurs in a given material has been very challenging for physicists for more than a hundred years, notwithstanding the major milestones, such as the London theory, the Landau-Ginzburg theory, and the BCS theory. The extreme challenge to predict the …
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Electrical and magnetic properties of twin-free single-crystal praseodymium-doped YBa2Cu3O7-d
"We have grown high quality single crystals of Y1-xPrxBaiCu30 7_8 (Pr-doped YBCO), and have succeeded in detwinning them by applying uniaxial stress. The quality of these samples was shown by both magnetic and electrical transport measurements. Each of these methods showed that our samples had …
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Phase Relations in the YBa2Cu3O7-x - SiO2 System and the Impact on Superconducting Fibers
… and analyses of the phase relations in the YBa2Cu3O7-x (YBCO)-SiO2 system at elevated temperatures. In this regard, a rigorous characterization study of the reaction phases within YBCO glass fibers, heat-treated YBCO+SiO2 pellets, rapid thermally annealed YBCO+SiO2 rods and rapid thermally …
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Planar Tunneling and Andreev Bound State Spectroscopy of YBa2Cu3O7- d Thin Films Using Solution-Deposited Zirconia Insulators
… spectroscopic measurements are performed on YBa2Cu3O7-δ (YBCO) thin films at four different crystallographic orientations. Since tunneling is a highly surface-sensitive probe on YBCO, films have been optimized for high surface quality. To fabricate the tunneling insulator, a novel fabrication …
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Enhanced High-Field Flux Pinning in YBa2Cu3O7-x Thin Films Through Engineering of Ba2YTaO6 Artificial Pinning Centres
… based on the high-temperature superconductor YBa2Cu3O7 are considered essential for fabricating high-field compact fusion magnets. An essential aspect in the development of these magnets is an understanding of the most effective pinning centre materials at low temperatures (10 K – 30 K) and …
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Hall effect in the superconducting and normal states in detwinned and twinned single crystals of zinc-doped YBa2Cu3O7-d
We have investigated the influence of zinc doping on the Hall effect in detwinned and twinned single crystals of YBa2Cu307..o. We observed the sign reversal of the Hall effect for crystals with superconducting transition temperature (Tc) as low as 58.51 K. Below the transition temperature, the Hall …
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