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Temperature and pressure raman studies of Hg1201 superconductors and oligo (para-phenylene) materials /Cai, Qingrui, January 2001 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 2001. / Typescript. Vita. Includes bibliographical references (leaves 123-128). Also available on the Internet.
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Temperature and pressure raman studies of Hg1201 superconductors and oligo (para-phenylene) materialsCai, Qingrui, January 2001 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 2001. / Typescript. Vita. Includes bibliographical references (leaves 123-128). Also available on the Internet.
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Single fluxoid thermal smearing and the second peak in YBa₂Cu₃O₇ /Kornecki, Michael, January 2003 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 2003. / Typescript. Vita. Includes bibliographical references (leaves 87-88). Also available on the Internet.
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Single fluxoid thermal smearing and the second peak in YBa₂Cu₃O₇Kornecki, Michael, January 2003 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 2003. / Typescript. Vita. Includes bibliographical references (leaves 87-88). Also available on the Internet.
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Numerical studies of phase fluctuations in cuprate superconductorsChen, Chen, 陈晨 January 2011 (has links)
published_or_final_version / Physics / Doctoral / Doctor of Philosophy
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Tracer diffusion of oxygen in YBa2Cu3O7-x from Monte Carlo simulations of an Ising-type model.Gumede, Stephen Napolian Zibusiso. January 1998 (has links)
In the research reported here, a two-dimensional Ising-type
model was used to study the tracer diffusion coefficients of
oxygen ions in YBa2Cu307-x (YBCO) for various values of oxygen
concentration and temperature.
The first chapter provides a brief introduction to the problem
considered in this thesis. This is followed by a short review of
superconductivity, with particular reference to the experimental
and theoretical aspects of high-temperature superconductivity and
its applications. The structure of YBCO is then presented, with
emphasis on its behaviour for various values of oxygen
concentration and temperature. The model used in the simulations
and the results for tracer diffusion coefficients and related
quantities obtained by previous workers concludes the chapter.
Results from other theoretical models are also included.
In the second chapter a theoretical background for the Monte
Carlo simulations employed in the present investigation is
discussed. This chapter includes a short account on how these
numerical methods evolved. The Monte Carlo approach to numerical
evaluation of integrals is described. Then the idea of Markov
sampling for obtaining members of the canonical ensemble is
presented, and the Metropolis algorithm is described. In
particular, convergence and the detailed balance condition are
discussed. The consequence of starting from an arbitrary initial
state when evaluating an observable of interest, and the effect
on the reliability of the values of observables, are analysed.
The chapter closes with a discussion of Monte Carlo methods
applied to a lattice model in statistical mechanics.
In chapter three results for the oxygen distribution produced by
the diffusion of oxygen in YBCO are presented. These results were
obtained from Monte Carlo simulations of the anti-symmetric nextto-
nearest neighbour Ising (ASYNNNI) model. In addition to the
uniform equilibrium distributions obtained by previous workers,
it is found that this model also possesses nonuniform equilibrium
oxygen distributions. The nonuniform distributions show a rich
phase structure, and some preliminary results for this structure
are presented.
Results for the tracer diffusion coefficients in the nonuniform
equilibrium distributions are given in the last chapter. Both
local and global tracer diffusion coefficients for nonuniform
equilibrium configurations are presented. Results obtained for
uniform and nonuniform equilibrium configurations are compared. / Thesis (M.Sc.)-University of Natal, Pietermaritzburg, 1998.
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Fabrication of Nanoscale Josephson Junctions and Superconducting Quantum Interference DevicesKitapli, Feyruz January 2011 (has links)
Fabrication of nanoscale Josephson junctions and Superconducting Quantum Interference Devices (SQUID) is very promising but challenging topic in the superconducting electronics and device technology. In order to achieve best sensitivity of SQUIDs and to reproduce them easily with a straightforward method, new fabrication techniques for realization of nanoSQUIDs needs to be investigated.
This study concentrates on investigation of new fabrication methodology for manufacturing nanoSQUIDs with High Temperature Bi-Crystal Grain Boundary Josephson Junctions fabricated onto SrTiO3 bi-crystal substrates using YBa2Cu3O7-δ (YBCO) thin-films.
In this process nanoscale patterning of YBCO was realized by using electron beam patterning and physical dry etching of YBCO thin films on STO substrates. YBCO thin films were deposited using RF magnetron sputtering technique in the mixture of Ar and O2 gases and followed by annealing at high temperatures in O2 atmosphere. Structural characterization of YBCO thin films was done by Scanning Electron Microscope (SEM) and Energy Dispersive X-ray Spectroscopy (EDX). Superconducting properties of thin films was characterized by AC magnetic susceptibility measurements. Nanoscale structures on YBCO thin films were fabricated by one E-Beam Lithography (EBL) step followed by Reactive Ion Etching (RIE) and physical dry etching. First SiO2 thin film were deposited on YBCO by RF magnetron sputtering and it was patterned by EBL using Polystyrene (PS) as resist material and RIE. Then SiO2 was used as an etch mask for physical dry etching of YBCO and nanoscale structures on YBCO were formed.
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Twinning studies on YBCO thin filmsNam, John. Preston, J. S. January 2005 (has links)
Thesis (Ph.D.)--McMaster University, 2005. / Supervisor: J. S. Preston. Includes bibliographical references (leaves 111-117).
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Twinning studies on YBCO thin filmsNam, John. Preston, J. S. January 2005 (has links)
Thesis (Ph.D.)--McMaster University, 2005. / Supervisor: J. S. Preston. Includes bibliographical references (leaves 111-117).
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Crystal chemistry of calcium-doped and calcium-free lead(2) strontium(2) R copper(3) oxygen(8+delta) (R = rare earth): Synthesis, structure and physical properties.Xue, Jiayu Simon. Greedan, J.E. Unknown Date (has links)
Thesis (Ph.D.)--McMaster University (Canada), 1992. / Source: Dissertation Abstracts International, Volume: 54-08, Section: B, page: 4182. Adviser: J. E. Greedan.
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