The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Investigation of potential oxygen defect mechanism of persistent photoconductivity and photoinduced superconductivity in YBa2Cu3Ox
Author:	Chew, Denise Catherine
View Online:	njit-etd1996-049 (xi, 81 pages ~ 2.8 MB pdf)
Department:	Department of Physics
Degree:	Master of Science
Program:	Applied Physics
Document Type:	Thesis
Advisory Committee:	Federici, John Francis (Committee chair) Savin, William (Committee member) Wilber, William (Committee member)
Date:	1996-01
Keywords:	Superconductivity. Photoconductivity.
Availability:	Unrestricted
Abstract:	In this thesis work, we conclude that oxygen vacancy defects play a fundamental role in the PPC/PISC mechanism and identify the oxygen defects as F centers (an oxygen vacancy which traps two electrons) or F+ centers. Also, the correlation between the peaks observed in the luminescence spectra and those observed in the wavelength dependence of PPC suggest that the photogeneration of charges and their annihilation via luminescent recombination occur in the same level (Cu-O chains) of the YBa2Cu3Ox crystal. Previous models had assigned the peaks in the PPC excitation spectrum to charge transfer in the CuO2 planes. In addition, photoluminescence and infrared spectroscopy are used to characterize the energy levels of the defects.