The Charging Effect in High-Tc Superconducting Thin Films
Abstract
The main objective of this grant was to conduct a careful and exhaustive experimental examination of the charging effect in high-temperature superconducting (HTS) thin films and perform research on novel superconducting electronic and optoelectronic devices operational at liquid-nitrogen temperatures. For this purpose, we developed a new, laser-based approach to processing of YBa2Cu3Ox (YBCO) thin films, exploiting the contrasting optical and electrical properties of the oxygen-poor (semiconducting) and oxygen-rich (superconducting) YBCO phases. Using laser writing, we fabricated, superconducting SuperFET structures, which consisted of a channel based on partially oxygen-depleted material or a Josephson weak-link and fully superconducting source and drain electrodes. We also developed microwave transmission lines, structures with nonuniform oxygen doping profiles, and photodetectors based on YBCO films containing regions with different oxygen contents. The physical mechanisms behind the performance of our test structures were investigated with the emphasis on their electrical and optoelectronic properties. Our interest was extended to studies of laser induced modifications of YBCO Josephson junctions and photoinduced oxygen reordering within grain-boundary weak links. Our basic physics experiments were aimed to investigate superconducting transport and superconducting fluctuations in HTS materials, especially in case of partially oxygen-depleted materials, when carriers were optically created.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 07, 1997
- Accession Number
- ADA331432
Entities
People
- Roman Sobolewski
Organizations
- University of Rochester