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Article
Aligned conical carbon nanotubes
Aligned conical carbon nanotubes (CCNTs) have been synthesized on catalyst-coated Si (100) substrates by a D.C. plasma-assisted hot filament chemical vapor deposition process. The same technique under slightly...
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Article
Recent status on high temperature superconducting Bi2Sr2CaCu2O8+x wire development at NYSIS: 1-90 meter length Jcs and 3 meter diameter ring furnace design
The status of long length, Bi2Sr2CaCu2O8+x (Bi-2212) wire development at the New York State Institute on Superconductivity (NYSIS) is reviewed and updated. Transport Jcs (4.2K, 0 T) of Bi-2212/Ag oxide powder-in-...
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Article
Degradation and Recovery of Transport Properties of Strained HTS Conductors
Mechanical bending of HTS tapes can result in the deterioration and destruction of their transport properties. Depending on the magnitude and type of strain (tensile or compressive), the films can be permanent...
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Article
Superconducting Behavior of YBa2Cu3O6.8/Bi2Sr2CanCun+1Ox Multilayers
Composite YBCO/BSCCO films on MgO(lOO) substrates were fabricated by using laser deposition. The structures and transport properties of these composite films were studied. The model of 3D percolating network i...
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Article
Critical current and microstructure of uniaxially aligned, polycrystalline YBa2Cu3O7−δ
Three processing routes that generate uniaxial alignment but otherwise yield very different microstructure and critical current are compared. Fine grain size and c-axis alignment are obtained in magnetically a...
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Article
Microstructures in Y-Ba-Cu-O Thin Films Investigated by XAFS Techniques
Superconducting films of YBa2Cu3O7-6 obtained by laser ablation on MgO and ZrO2 substrates were investigated by soft x-ray absorption fine structure technique (XAFS) at O K-edge. Local environment around oxygen a...
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Article
Flexible stainless steel foil as a substrate for superconducting Y-Ba-Cu-O films
As-deposited superconducting Y-Ba-Cu-O films have been grown on stainless steel substrates by the plasma assisted laser deposition technique. Low interfacial diffusion of iron at the 550°C growth temperature e...
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Article
Critical Current Density of Narrow Superconducting Thin Films Fabricated by Laser Ablation Techniques
The variations of critical current density Jc of narrow Y-Ba-Cu-O films as a function of temperature and magnetic field are investigated. Films with thickness of 150-200 nm and width of 20-100 urn were prepared b...
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Article
Soft X-Ray Studies of Y-Ba-Cu-O Thin Films Prepared by Laser Ablation
Angular variation of x-ray fluorescence due to oxygen atoms in high-T Y-Ba-Cu-O thin films is measured for the first time by using a new parallel plate avalanche chamber. This technique allows the possibility ...
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Article
Laser Patterning and Electrical Properties of Submicron Lines of Y-Ba-Cu-O
0.6 µm-wide lines of high Tc Y-Ba-Cu-O have been fabricated by direct laser writing on mirror-like thin films which were grown by laser deposition without post annealing. Laser ablation etching had no effect on t...
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Article
Study of In-Situ Laser-Deposition of Superconducting Thin Films by In-Situ Resistance Measurement
The electric resistance was measured in real time during laser evaporation deposition of superconducting thin films. It was found that different substrates led to different behaviors in the temporal change of ...
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Article
Y1Ba2Cu3O7-x Films from Nitrate Solution using Rf Plasma Deposition
A nitrate solution of Y, Ba and Cu was atomized and introduced into an inductively coupled argon - oxygen plasma operated at 4.4 kW and 13.56 MHz under atmospheric pressure. As-deposited superconducting films ...
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Article
Fabrication of High TC Superconducting Composite Structure
The laser ablation technique was used to fabricate high Tc superconducting composite structures. The multilayered structures were fabricated in-situ by changing the target during deposition. Thin MgO films and yt...
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Chapter
Superconducting Films of Bi-Sr-Ca-Cu-O by Laser Deposition
Superconducting Bi-Sr-Ca-Cu-O (BSCCO) films have been grown on single crystal [100] MgO by laser deposition. The films are highly c-axis oriented perpendicular to the substrate. The 2212, 2223 and 2234 phases ...
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Chapter
Plasma-Assisted Laser Deposition of Superconducting Thin Films — A Basic Study
An experimental study of the process of plasma-assisted laser deposition was described. It was found that atomic beams of Y,Ba,Cu, and O were inportant for the in-situ growth of superconducting films. These at...
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Chapter
RF Plasma Deposition of YBa2Cu3O7−x Films
Superconducting YBa2Cu3O7−x films have been grown on single crystal yttria stabilized zirconia by rf plasma deposition from an aqueous solution of the nitrates of Y, Ba and Cu. The as-grown films are highly c-axi...
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Chapter
Studies of Microstructures in High-Tc Superconductors by X-ray Absorption Techniques
Fluorescence emission and total-electron-yield vs. grazing angle of incidence at fixed energy of incoming soft x-ray radiation, around O is absorption edge, for YBa2Cu3O7−δ and Bi2Sr2 CaCu2O8+x thin films on MgO ...
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Chapter
Multilayer Flexible Oxide Superconducting Tapes
Superconducting Y-Ba-Cu-O films have been grown on mirror-finished flexible stainless steel substrates. Plasma assisted laser deposition (PLD) technique enabled us to grow these films at a reduced substrate te...
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Chapter
Physics of in-Situ Oxide Superconducting Thin Films Deposition
The physics of the in-situ laser deposition process is reviewed. Emphasis will be placed on the use of excimer lasers, and the deposition of Y-Ba-Cu-O thin films. It is shown that the laser target interaction ...
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Article
Superconducting properties of mixtures of Y1Ba2Cu3O9−x and Y1.8Ba0.2Cu1O5−y
The superconducting properties of heat-treated mixtures of Y1Ba2Cu3O9−x (A) and Y1.8Ba0.2Cu1O5−y (B) have been studied. As the concentration of B increases, the Meissner effect decreases, while the resistance jum...
