Assessment of Superconductivity Enhancement Claimed to Occur in Small Particle-Normal Metal Matrix Composite Superconductors

摘要

The claims of substantially enhanced superconducting transition temperature, T sub c, and upper critical field, H sub c2, are judged implausible. This conclusion was reached by comparing the claims with what is theoretically expected using current theories, experimental results, and concepts of superconductivity of high-T sub c material. However, the Battelle approach holds some promise of achieving both good mechanical and good superconducting properties in a practical conductor. AC losses and proximity effects in the composites need careful consideration in the evolution of a practical composite conductor. (Author)