Oxygen-17 Nuclear Magnetic Resonance Studies of High Temperature Superconductors PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Oxygen-17 Nuclear Magnetic Resonance Studies of High Temperature Superconductors PDF full book. Access full book title Oxygen-17 Nuclear Magnetic Resonance Studies of High Temperature Superconductors by Christopher Nicholas Coretsopoulos. Download full books in PDF and EPUB format.
Author: Christopher Nicholas Coretsopoulos Publisher: 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.
Author: Christopher Nicholas Coretsopoulos Publisher: 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.
Author: Henry Nathaniel Bachman Publisher: ISBN: Category : Languages : en Pages :
Book Description
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: Linda Reven Publisher: ISBN: Category : Languages : en Pages :
Book Description
In this study, solid state nuclear magnetic resonance (NMR) spectroscopy is used to investigate the structural, electronic, and dynamical properties of a variety of high temperature oxide superconductors and metal carbonyls adsorbed on metal oxide surfaces. The first five chapters describe the $\sp{17}$O Knight shift, nuclear spin lattice and spin-spin relaxation measurements carried out on a large number of cuprate, bismuthate and plumbate superconductors. After briefly reviewing the basic theory of the NMR parameters of metals in the normal and superconducting states, a detailed $\sp{17}$O NMR study of YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-x}$, is described in Chapter 2. Chapter 3 contains a comparative study of Tl$\sb2$Ba$\sb2$CaCu$\sb2$O$\sb{\rm 8+x}$, Bi$\sb2$Sr$\sb2$CaCu$\sb2$O$\sb{\rm 8+x}$, YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-x}$, and La$\sb{1.85}$Sr$\sb{0.15}$CuO$\sb4$. In this chapter, the $\sp{17}$O nuclear spin lattice relaxation and Knight shift measurements on La$\sb{1.85}$Sr$\sb{0.15}$CuO$\sb4$ are compared to the theoretical model of Monien, Millis, and Pines of an antiferromagnetic Fermi liquid state. In Chapter 4, it is shown that the normal state nuclear spin lattice relaxation behavior of the "copper-free" superconductors can be accounted for by a simple p conduction band model. The $\sp{17}$O NMR results for the different families of oxide superconductors are summarized in Chapter 5. The $\sp{17}$O NMR parameters of the bismuthate and plumbate superconductors show these materials to be weakly metallic oxides with T$\sb1$T values which are consistent with a BCS-like relationship between the electronic density of states and T$\sb{\rm c}$. The normal state of the cuprate superconductors display properties consistent with the presence of magnetic interactions and their T$\sb1$T values show little variation with T$\sb{\rm c}$. Finally, in Chapter 6 of this thesis, earlier work using $\sp{13}$C variable temperature magic angle sample spinning (MAS) NMR to study the surface chemistry and fluxional behavior of Fe$\sb3$(CO)$\sb{12}$ and Ru$\sb3$(CO)$\sb{12}$ adsorbed on a variety of metal oxide surfaces is described.
Author: Christopher Nicholas Coretsopoulos
Author: Christopher Nicholas Coretsopoulos
Author: Nicholas James Curro
Author: Krzysztof R. Górny
Author: A. P. Howes
Author: Henry Nathaniel Bachman
Author: Linda Reven![Nuclear Magnetic Resonance and High Temperature Superconductivity in Y[subscript 1-x]Pr[subscript X]Ba2Cu3O-- PDF](https://books.google.com/books/content/images/frontcover/RHMu10RvVA4C?fife=w80-h100)
Author: Arneil Payongayong Reyes
Author: Andrew Paul Howes
Author: Charles H. Recchia
Author: Anant Narlikar