Accession Number : ADA331432

Title :   The Charging Effect in High-Tc Superconducting Thin Films

Descriptive Note : Final rept. 1 Jan 94-30 Jun 97

Corporate Author : ROCHESTER UNIV NY DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Sobolewski, Roman

PDF Url : ADA331432

Report Date : 07 OCT 1997

Pagination or Media Count : 10

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.

Descriptors :   *ELECTROOPTICS, *THIN FILMS, *HIGH TEMPERATURE SUPERCONDUCTORS, LASER APPLICATIONS, DOPING, PHOTODETECTORS, MICROWAVE TRANSMISSION, BOLOMETERS.

Subject Categories : Electrooptical and Optoelectronic Devices
      Mfg & Industrial Eng & Control of Product Sys
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE