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Showing 1 to 20 of 71 for “"YBCO"”.
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Conversion kinetics of oxyfluoride-derived YBCO films
YBa2Cu3O7-x (YBCO) thin films were prepared on lanthanum aluminate (LAO) single crystals and buffered (5000 Y20 3, 500 Ce02) Ni-single crystal substrates by metal organic deposition (MOD) process. Glassy films were converted to epitaxial YBCO films, by heating in wet atmosphere of N2/02 mixture. A …
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Design and optimization of a YBCO based superconducting bolometer
L'abstract è presente nell'allegato / the abstract is in the attachment
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High-field SANS studies of the vortex lattice in YBCO
In this thesis is presented the first high-field structural study of the vortex lattice in YBa\(_2\)Cu\(_3\)O\(_7\). Small-angle neutron scattering was used to deduce the configuration of vortices in a twinned sample of YBa\(_2\)Cu\(_3\)O\(_7\) over the field range 1–11T applied parallel to the …
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Conductivity and Interferometry Experiments on YBCO/lead Ramp-Edge Josephson Junctions
… cuprate superconductor YBa 2Cu3O7-y (YBCO) using YBCO/Pb ramp-edge Josephson junctions with lithographically defined corner and straight-edge geometries. Measurements of the critical current versus applied field, I c(H), and the an dynamic conductance, dI/dV, are presented. For …
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Conductivity and Interferometry experiments on YBCO/Pb Ramp-Edge Josephson Junctions
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-13T02:26:38Z No. of bitstreams: 1 hilliard.pdf: 21104520 bytes, checksum: 04a718c8258d783f199317b7e9ea37a4 (MD5)
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An experimental device for critical surface characterization of YBCO tape superconductors
… twisting stacked tape cabling (TSTC) method for YBCO superconductors is very attractive for high current density, high magnetic field applications, such as nuclear fusion reactors and high energy physics experiments. Industrial scale assembling methods have been proposed, and cable samples have …
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Melt growth and microstructural control of single crystal YBCO high temperature superconducting materials
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1997.
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Enhancement Of Magnetic Vortex Pinning by APCs with Coherent BZO 1D-APC/YBCO Interface
… superconductors (HTS) such as YBa2Cu3O7-x (YBCO). Unfortunately, a degraded APC/YBCO interface can limit the pinning force making high field/high Jc applications unfeasible. The effect of APC/YBCO interface on pinning is best exemplified by the difference in pinning force generated by c-axis …
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Understanding the origin of the recovery of superconductivity in halogenated YBCO single crystal : atomic structure study
… in underdoped YBa_2Cu_3O_{6+y} (YBCO) by exposure to bromine, iodine, chlorine and fluorine is a long-standing problem which has not been clearly resolved. The key question concerns the role of these halogens in the lattice. In order to shed light to this problem, we have …
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Convective heat transfer model for determining quench recovery of high temperature superconducting YBCO in liquid nitrogen
… cool HTS devices. Yttrium barium copper oxide (YBCO), an HTS with critical temperature of 93 K, is a promising HTS for transmission cables and electric power devices. However, before the coated YBCO conductor can be used, stability of the superconductor must well understood. One important …
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Phase Relations in the YBa2Cu3O7-x - SiO2 System and the Impact on Superconducting Fibers
… 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 annealed YBCO …
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Improving the mechanical properties of Y-Ba-Cu-O single grain bulk superconductors
… the mechanical properties of single grain YBCO bulk superconductors without causing significant detrimental effects to the superconducting properties of the material. It is widely acknowledged that large single grains of GdBCO and SmBCO with silver can be batch processed successfully with …
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Ultrafast Machining of High Temperature Superconducting Nanostructures for Novel Mesoscale Physics
The high temperature superconductor YBa2Cu3O7-x (YBCO), with its critical temperature above the boiling point of liquid nitrogen, promised to make the use of superconductors in industrial applications affordable. When focussing on electrical applications such as antennas and sensors, patterning of …
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YBa2Cu3O7-x thin films prepared by Chemical Solution Deposition
… 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 high-applied magnetic …
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The microstructure, mechanical and superconducting properties of (RE)BCO bulk single grains
… measured trapped field in 22 different sized YBCO bulk superconductors. A correlation between porosity and *J<sub>c</sub>* was established by evaluating the experimental results statistically using Spearman’s correlation coefficient. The direct correlation between porosity and *J<sub>c</sub>* …
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Normal state properties of high-angle grain boundaries in Y$_{1-x}$Ca$_{x}$Ba$_{2}$Cu$_{3}$O$_{7-}$$_\delta$
… in YBa$_{2}$Cu$_{3}$O$_{7-}$$_\delta$ (YBCO) and Y$_{1-x}$Ca$_{x}$Ba$_{2}$Cu$_{3}$O$_{7-}$$_\delta$ (calcium-doped YBCO). YBCO is a high-temperature superconducting material with a superconducting transition temperature up to 93 K. Grain boundaries are interfaces between two crystals or …
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An investigation into high temperature superconducting flux pump technology with the circular type magnetic flux pump devices and YBaCuO films
… phase connection). A 2 inch diameter round shape YBCO thin film (200 nm thick of the YBCO layer) and a 46 mm× 46 mm square shape YBCO tape (1.0 µm thick of the YBCO layer, with a hole of Φ26 mm in the centre) were tested. When using a round shape YBCO thin film and the original CTMFP magnet, it …
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Experimental determination of the symmetry of the superconducting pairing state in yttrium barium copper oxide
… I present measurements of bimetallic Pb-Au-YBCO dc SQUIDs (Superconducting QUantum Interference Devices) and Josephson junctions that provide an important clue to the origin of the pairing mechanism for high temperature superconductivity in the cuprates. By probing the momentum space …
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Growth and characterisation of textured superconducting tapes
… laser deposition (PLD) was used to deposit YBCO on MgO buffered substrates. The characterization of the thin films was done using SEM, EBSD, XPS, AFM, X-ray diffraction 2-scans, rocking curve (-scans), phi () scans, X-ray pole-figure measurements, and AC susceptibility. YBCO deposition by …
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Variable-temperature photoluminescence emission instrumentation and measurements on low yield metals
… polycrystalline PbMo6S8 and single crystal YBCO were made for λex = 488 nm as a function of temperature (72 K < T < 300 K), time (t < 12 hours), excitation power (P < 120 mW) and position on the sample using a high sensitivity instrument which was designed, commissioned and calibrated for …
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