Investigation of potential oxygen defect mechanism of persistent photoconductivity and photoinduced superconductivity in YBa2Cu3Ox

Author

Denise Catherine Chew, New Jersey Institute of Technology

Document Type

Thesis

Date of Award

Fall 1-31-1996

Degree Name

Master of Science in Applied Physics - (M.S.)

Department

Physics

First Advisor

John Francis Federici

Second Advisor

William Savin

Third Advisor

William Wilber

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 YBa₂Cu₃O_x 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.

Recommended Citation

Chew, Denise Catherine, "Investigation of potential oxygen defect mechanism of persistent photoconductivity and photoinduced superconductivity in YBa2Cu3Ox" (1996). Theses. 1086.
https://digitalcommons.njit.edu/theses/1086