Author: Robert Glenn FlorencePublisher:
ISBN:
Category : Sputtering (Physics)
Languages : en
Pages : 210
Book Description
Sputter Deposition of Yttrium-barium-copper-oxide Superconducting Thin Films
Author: Robert Glenn FlorencePublisher:
ISBN:
Category : Sputtering (Physics)
Languages : en
Pages : 210
Book Description
Deposition of Yttrium Barium Copper Oxide Superconducting Thin Films by RF Magnetron Sputtering
Author: Vijay Dattatraya ParkhePublisher:
ISBN:
Category :
Languages : en
Pages : 260
Book Description
Yttrium-barium-copper Oxide Superconducting Thin Films
Author: Charles Wesley TangerPublisher:
ISBN:
Category : High temperature superconductivity
Languages : en
Pages : 198
Book Description
High Rate Sputter Deposition Method for Superconductors
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 31
Book Description
Magnetron sputtering deposition is potentially the most economical deposition method for thin films. Presently sputtering can't deposit high temperature superconductors like Yttrium Barium Copper Oxide (YBCO) because of negative oxygen ion bombardment damage. Lowering the plasma discharge voltage to less than 100 volts would decrease such damage and make YBCO economically practical. The goal of this phase I effort was to lower plasma discharge voltages using high magnetic fields. Our results showed that high magnetic fields alone can lower plasma voltages to about 200 volts. Just as important, we showed that plasma impedance was lowered by more than ten times. Low plasma impedance allows high magnetic fields and electron injection into the plasma to be combined to lower plasma voltage to 30 volts. This combination removes the power limitations of electron injection. It should also produce epitaxial quality thin film semiconductors because low voltages allow 'self-bombardment' where the adatoms have the optimum energy to form a crystalline matrix at lower temperatures. The method is also applicable to thin film semiconductors such as II-VI solar cells and III-V films.
Thin Films and Josephson Junctions of Yttrium Barium Copper Oxide
Author: Peter Andrew RosenthalPublisher:
ISBN:
Category :
Languages : en
Pages : 430
Book Description
Sputter Deposition and Thallination of Thallium-barium-calcium- Copper-oxide Superconducting Thin Films
Author: Tushar Heramb DhayagudePublisher:
ISBN:
Category : High temperature superconductors
Languages : en
Pages : 196
Book Description
Part I : Growth and Properties of Reactively Coevaporated Superconducting Yttrium-barium-copper-oxide Thin Films. Part II : Amorphous Superconducting/normal-metal Multilayers in Novel Geometries
Author: Vladimir Cort MatijasevicPublisher:
ISBN:
Category :
Languages : en
Pages : 416
Book Description
Superconducting Electronic Film Structures
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 26
Book Description
Bulk samples of the new oxide superconductors were prepared and some of their properties measured. Thin films of yttrium-barium-copper-oxide, completely superconducting below 85K, were prepared by both sputtering and evaporation. The sputtered films on (100) and (110) strontium-titanium-oxide substrates were epitaxial. A correlation between oxygen content in as-deposited films and the formation of non-superconducting surface layers was established. The thickness of these layers was greatly reduced by sputtering in argon and oxygen gas mixtures. The presence of fluorine in the evaporated films was also found effective in minimizing the barium segregation which produces such layers. Zero resistance gold contact layers were obtained on Y-Ba-Cu-O-sputtered films which were processed entirely in situ. Tunneling data using a low-temperature tunneling microscope were obtained on both evaporated and sputtered Y-Ba-Cu-O films. A new surface characterization capability based on the analysis of (Low Energy Electron Diffraction) or (Reflection High Energy Electron Diffraction) diffraction spot intensity was developed.
Flux Pinning in Yttrium Barium Copper Oxide Superconducting Thin Films
Author: Penelope Anne PullanComparative Characterization of Superconducting Thin Films Fabricated by Different Techniques
Author: Padma Prasuna S. VemulakondaPublisher:
ISBN:
Category : Superconductivity
Languages : en
Pages : 84
Book Description
The goal of this thesis is to compare the chemical and compositional profiles, grain structure and critical current densities of superconducting Yttrium Barium Copper Oxide(Y1Ba2Cu3O7-x or YBCO) layers grown by different competing techniques on a variety of substrates and buffer layers. The idea is to check if there can be variation of cationic ratios, impurities, possible diffusion of substrate/buffer layer atoms into the YBCO for different processing methods and microstructures. Pulsed Laser Deposition (PLD), Metal Organic Deposition (MOD) and Metal Organic Chemical Vapor Deposition (MOCVD) films on Ion Beam Assisted Deposited (IBAD)-textured buffer layers and, Rolling Assisted Biaxial textured substrate (RABiTS) combinations have been compared. X-ray Photoelectron Spectroscopy (XPS) has been used in conjunction with ion beam sputtering as well as gentle chemical etching to obtain composition and chemistry information at different depths into the film. Correlation with Secondary Ion Mass Spectroscopy (SIMS) has been obtained as needed. Top view as well as cross section Scanning Electron Microscope (SEM) was performed for microstructure analysis. Using the gentle chemical etching method, depth profiling of composition and microstructure of the films has been achieved. It is seen that variations in microstructure occur along the depth of the superconducting layer even when the composition is uniform. The density and the micro-structural uniformity vary significantly from one deposition technique to other. The durability and stability of these films, microstructure, depth profiling have been compared and will be presented. This thesis provides important information on variations of the YBCO films from one deposition technique to another.