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An analysis of electrical transport and magnetic susceptibility properties of YBa2Cu3O7-[delta] and La2-xSrxCuO4 high Tcsuperconductors俞大風, Yu, Tai-fung. January 1997 (has links)
published_or_final_version / Physics / Doctoral / Doctor of Philosophy
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Preparation and magnetic properties of mercury deficient Hgâ†1â†-â†xBaâ†2CuOâ†4â†#delta#Giblin, S. P. January 1997 (has links)
No description available.
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Design and fabrication of the HTS synchronous motor using 2G-HTS stacked tapesBaghdadi, Mehdi January 2016 (has links)
No description available.
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I. Molecular simulations of buckyball fullerenes. II. Quantum chemistry studies on high-Tc superconductorsGuo, Yuejin. Goddard, William A., January 1900 (has links)
Thesis (Ph. D.)--California Institute of Technology, 1992. UM #92-32, 184. / Advisor names found in the Acknowledgments pages of the thesis. Title from home page. Viewed 02/01/2010. Includes bibliographical references.
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Thermal conductivity studies of YBa₂Cu₃O₇₋δDelap, Martin Richard January 1990 (has links)
Apparatus to measure the thermal conductivity of YBa(_2)Cu(_3)O(_7-δ) at temperatures between 20K and 120K has been designed and constructed. The thermal conductivity is measured using a longitudinal steady state heat flow technique. Thermal conductivity measurements have been performed upon a sample of YBa(_2)Cu(_3)O(_7-δ) which has been subjected to a series of heat treatments in order to remove oxygen from the material. The measurements show conclusively that the thermal conductivity of YBa(_2)Cu(_3)O(_7-δ) is very strongly influenced by the oxygen content of the material. A reduction of the oxygen content of the material results in a substantial lowering of the thermal conductivity. To explain this result, a quantitative model has been constructed; the model demonstrates that consideration of the changes in phonon interactions alone cannot account for the differences in the behaviour of the thermal conductivity of YBa(_2)Cu(_3)O(_6) and YBa(_2)Cu(_3)O(_7). In addition; the model, shows that there must be a significant carrier contribution to the thermal conductivity in both the normal and superconducting states. A physical process has been proposed which provides the required large carrier contribution below T(_c). Further studies have been performed on a series of samples of YBa(_2)Cu(_3)O(_7-δ) which were sintered at slightly different temperatures. Qualitative analysis of the physical properties, of these samples has been performed.
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Novel light absorbing species for a wavelength-selective high-temperature superconducting bolometer /Eames, Sara Jennifer, January 2000 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2000. / Vita. Includes bibliographical references. Available also in a digital version from Dissertation Abstracts.
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An analysis of electrical transport and magnetic susceptibility properties of YBa2Cu3O7-[delta] and La2-xSrxCuO4 high Tc superconductors /Yu, Tai-fung. January 1997 (has links)
Thesis (Ph. D.)--University of Hong Kong, 1998. / Includes bibliographical references.
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High Tc superconductors and the contact propertiesHuang, Hua January 1992 (has links)
Methods of processing large grained textured superconductor have been successfully developed, based on a melt texturing process. Large grained textured superconductor with grain size over 10mm along the growth direction and Jc over 3600A/cm<sup>2</sup> (77K, 0.5 Tesla) has been produced in both one - zone and two - zone furnaces with good reproducibility. Two kinds of design of reactive metal contacts have been proposed and investigated, aiming to make low resistivity contacts with strong mechanical strength. Three possible reactive contact metals have been tested for contact making, and the microstructures at the interfaces have been studied to find the relations between contact resistivity and contact processing conditions. Titanium/noble metal multilayer contacts is a promising type of contact technique for low resistivity and strong mechanical bonds. Gold and silver contacts give resistivities among the best reported results in the literature, and they turned out to be extremely stable in time, could withstand repeated thermal cycling from room temperature to 10K and yield very reproducible R-T curves. The electrochemical titration method has been used to increase the oxygen stoichiometry of bulk textured YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub> samples. The electrochemical titration method can further oxidize melt textured thick film YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub> samples in which it may be difficult to further improve oxygen content by conventional annealing. The solid state electrochemical cell has been used to study the thermodynamic properties of the Y-Ba-Cu-O system at high oxygen pressure by measuring the oxygen activity versus time continuously immediately after the electrochemical titration. A series of computer models have been set up according to the microstructure of the contact interface to simulate the complicated contact resistivity behaviours. The nature of, and geometry of, the reaction products at the contact interfaces may be revealed by the temperature dependence of the contact resistance. This information combined with direct observations on the structure and chemistry of the contacts provided a fuller understanding of conduction mechanism at the contact interface.
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Density matrix renormalization group study of the enhanced hole-hopping model of high temperature superconductivity /Minor, Bill. January 1996 (has links)
Thesis (Ph.D.) -- McMaster University, 1997. / Includes bibliographical references (leaves l05-110). Also available via World Wide Web.
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High temperature superconducting YBa2Cu3O7 thin flims and bolometers/Öktem, Bülent. Abukay, Doğan January 2006 (has links) (PDF)
Thesis (Master)--İzmir Institute of Technology, İzmir, 2006 / Keywords: Superconductivity, bolometer. Includes bibliographical references (leaves. 74-78).
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