Potential for High Temperature Superconductivity.
Abstract
The investigation of Cu Cl at high pressure revealed magnetic anomalies that were characteristic of a superconducting state. Subsequent to these investigations similar effects were observed in pressure quenched CdS. These preliminary results were very promising, though considerably more work was required to confirm the mechanism as well as to gain a better understanding of the materials that exhibit the desired properties. In view of these observations an LDF program was initiated, the goal of which was to reproduce some of the magnetic anomalies and to try to understand something of the mechanism as well as what properties the materials needed to demonstrate the effect. The initial investigations were very devoted to Cu Cl since more was known about the high temperature diamagnetic anomaly in this material than any other material. Pressure cells were constructed and a variable temperature Dewar was obtained so the magnetic properties could be investigated over a temperature to liquid helium temperature. The necessary equipment was assembled to measure the diamagnetic and paramagnetic susceptibilities. Cu Cl crystals were grown from the melt from the vapor phase and by a flux technique. The first experiments that were done were optical experiments designed to characterize the starting material as well as to obtain information relating to the material properties that might relate to the mechanisms involved. From high resolution emission experiments a center was observed that could be then center from which the superconducting electrons are supplied as predicted by theory. Studies were made on pressure quenched CdS where both diamagnetic and paramagnetic anomalies were observed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1982
- Accession Number
- ADA120156
Entities
People
- Donald C. Reynolds
- S. B. Nam
- Yunsie Chung
Organizations
- Wright Laboratory