Processing of Mixed Oxide Superconductors
Abstract
This work was initiated soon after the discovery of high temperature superconductors. Although much effort was being put into the research for higher temperature materials, it rapidly became clear that the main obstacle to the application of these materials was the low critical current density. Although in conventional materials the critical current density was determined by the pinning of flux lines by defects in the microstructure in high Tc materials, the appearance of weak links, or Josephson Junctions, at grain boundaries was the dominant effect. This was a completely new phenomena and led not only to rather low critical current densities in zero field but to a catastrophic drop in fields of only a few millitesla, although the upper critical field of these materials is extremely high (probably greater than 150 Tesla). The work can be divided into four main sections. These are magnetic separation, levitation, screening, and critical current studies.(ttl)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1990
- Accession Number
- ADA229845
Entities
People
- A. M. Campbell
- M. F. Ashby
Organizations
- University of Cambridge