Investigations of YBaCuO Materials with Near-Room-Temperature Resistivity Transitions.
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 an oxygen atmosphere during measurments. 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 characteristic of a weak superconducting phase being present. The synthesis conditions and structural information on multi-phase YBaCu0 samples exhibiting reproducible flux-trapping phenomenon at 336 K is also detailed. In addition, studies of the paramagnetic Meissner effect on a niobium disk and of Josephson properties in YBa2Cu3O7 single crystals and YBaCu0 thin films are reported. jg
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 14, 1994
- Accession Number
- ADA293405
Entities
People
- J. T. Chen
- Lowell E. Wenger
Organizations
- Wayne State University