Nuclear Magnetic Resonance Studies of Vortex Dynamics in High Temperature Superconductors PDF Download
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Author: Charles H. Recchia
Publisher:
ISBN:
Category :
Languages : en
Pages : 242
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Author: Charles H. Recchia
Publisher:
ISBN:
Category :
Languages : en
Pages : 242
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Author: Craig Thomas Milling
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Category :
Languages : en
Pages : 214
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Author: Nicholas James Curro
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Category :
Languages : en
Pages : 418
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Author: Vesna F. Mitrović
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Category :
Languages : en
Pages :
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In the vortex core region, we find that the NMR rate is strongly enhanced in high magnetic fields implying the existence of some sort of bound state in the vortex core.
Author: Krzysztof R. Górny
Publisher:
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Category :
Languages : en
Pages : 450
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Author:
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Category :
Languages : en
Pages :
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Author: Henry Nathaniel Bachman
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Category :
Languages : en
Pages :
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This dissertation reports on nuclear magnetic resonance (NMR) experiments of high temperature superconductors (HTS) in the presence of high magnetic fields ranging from 2.1 T up to 27.3 T.
Author: Christopher Nicholas Coretsopoulos
Publisher:
ISBN:
Category :
Languages : en
Pages : 250
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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.
Author: Jacob Theodoor Moonen
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: George Reiter
Publisher: Springer Science & Business Media
ISBN: 1468474901
Category : Science
Languages : en
Pages : 359
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This NATO Advanced Research Workshop was held at a time when there was little consensus as to the mechanism for high temperature superconductivity, in the context of a world undergoing major changes in its political alignments and sense of the possibility for the future. It was characterized by generosity in the sharing of our uncertainties and speculations, as was appropriate for both the subject matter and the context. The workshop was organized, of necessity around the experimental work, as is this volume. Where the theoretical work is directly relevant to particular experiments, it is included in the appropriate sections with them. Most of the participants felt strongly that magnetic fluctuations played an important role in the mechanism for high T c, although with the exception of the IlS R work reported by Luke showing results inconsistent with the anyon picture, and the work on flux phases by Lederer, the mechanism remained an issue in the background. A major focus was the phenomenological interpretation of the NMR data.
