Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Nuclear Magnetic Resonance Studies of the Effect of Vortices on the High Temperature Superconductor Yttrium Barium Copper Oxide
Author: Nuclear Magnetic Resonance Studies of the Effect of Vortices on the High Temperature Superconductor YBa2̳Cu3̳O7̳
Author: Craig Thomas MillingPublisher:
ISBN:
Category :
Languages : en
Pages : 214
Book Description
Nuclear Magnetic Resonance Studies of Vortex Dynamics in High Temperature Superconductors
Author: Charles H. RecchiaNuclear Magnetic Resonance Studies of the High Temperature Superconductors in the Normal and Superconducting States
Author: Nicholas James CurroPublisher:
ISBN:
Category :
Languages : en
Pages : 418
Book Description
Dissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 818
Book Description
Energy Research Abstracts
Author: Analysis of Yttrium-Barium-Copper-Oxide by X Ray Diffraction and Mechanical Characterization
Author: National Aeronautics and Space Adm NasaPublisher: Independently Published
ISBN: 9781729174586
Category : Science
Languages : en
Pages : 30
Book Description
The efforts in developing high-temperature superconductor (HTSC) YBa2Cu3O7 electrical leads are to benefit future NASA missions that will carry payloads with sensitive instruments operating at cryogenic temperatures. Present-day leads made of copper or magnesium are responsible for as much as 50 percent of the parasitic heat load on cryogenic systems. A reduction of this load could be achieved by replacing the conventional materials with HTSC ceramic electrical leads. Superconductor quality has become a concern in the industry, as has the development of effective evaluation methods. The factors that need to be examined for these materials include material purity, mechanical properties, and superconducting ability below the critical temperature. We applied several methods to study these factors: thermogravimetric analysis, x-ray diffraction, tensile testing, and laser-generated ultrasound. Our objectives were to determine the average tensile strength and Young's modulus of the HTSC material and to compare them to those values for copper and manganin. Arsenovic, Petar Goddard Space Flight Center
Nuclear Magnetic Resonance of Oxygen and Yttrium in the Normal State of Yttrium Barium Copper Oxide
Author: Valerie Ann NandorStudy of the Short Time Flux Relaxation in the High Temperature Superconductor Yttrium-barium-copper-oxide
Author: Li GaoPublisher:
ISBN:
Category : Copper oxide superconductors
Languages : en
Pages : 268
Book Description
Oxygen-17 Nuclear Magnetic Resonance Studies of High Temperature Superconductors
Author: Christopher Nicholas CoretsopoulosPublisher:
ISBN:
Category :
Languages : en
Pages : 250
Book Description
This study presents $\sp{17}$O NMR spectra of randomly and magnetically oriented samples of various high-$T\sb{c}$ superconductors. Systems under investigation include: (BaK)BiO$\sb3$, La$\sb{1.85}$Sr$\sb{0.15}$CuO$\sb4$, YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-x}$, Bi$\sb2$Sr$\sb2$CaCu$\sb2$O$\sb8$ and Tl$\sb2$Ba$\sb2$CaCu$\sb2$O$\sb8$. Measurements of the angular dependence of the oxygen frequency shifts and corresponding satellite transitions have enabled us to assign the oxygen sites of magnetically oriented YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-x}$, as well as determine the e.f.g. parameters for various sites. The temperature and angular dependence of the oxygen frequency shifts and relaxation rates have been studied as well as the effect of the oxygen stoichiometry and rare earth substitutions. Finally, we have compared the $\sp{17}$O frequency shifts of YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-x}$ to those of the precursor oxides, and other high-$T\sb{c}$ compounds, and have consistently observed a paramagnetically shifted feature associated with the CuO$\sb2$ planes ($\sim$2000 ppm from H$\sb2$O) and a second feature or set of features in the diamagnetic region (typically at $\sim$400 ppm from H$\sb2$O) which are attributed to sites other than the CuO$\sb2$ planes. Precursor effects in the normal phase of YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-x}$ are investigated, pointing strongly to antiferromagnetic fluctuations which may persist in the superconductive phase.