Synthesis and Characterization of CuO Superconductors with High Transition Temperatures.
Abstract
This final technical report describes the continual superconductivity research on the materials and structural phases responsible for the above 200-K superconducting transitions, their synthesis conditions, and the study of the physical properties associated with these transitions. Resistive transitions having superconducting-like character have been observed in multi-phase ceramic YBaCu0 samples and on surfaces of nominal YBa2Cu3O7 single crystals in the temperature range of 260 K to 340 K. The appearance of these transitions appears to require certain experimental measuring conditions including and oxygen atmosphere during measurements. Magnetization studies on these materials show a flux-trapping hysteretic behavior at similar temperatures, i.e., a more diamagnetic behavior in the zero-field-cooled- magnetization than the field-cooled-magnetization, which is characteristic of a weak superconducting phase being present. The synthesis conditions and structural information on multi-phase YBaCuO samples exhibiting reproducible flux-trapping phenomenon at 336 K is also detailed. jg
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 31, 1995
- Accession Number
- ADA292478
Entities
People
- J. T. Chen
- Lowell E. Wenger
Organizations
- Wayne State University