Superconducting Thin Films, Composites and Functions
Abstract
The important issue of how the superconducting transition temperature Tc in disordered systems changes near the M-I transition where strong localization is expected has been studied in the Mo-Ge system. In the high Mo concentration, which is in the weakly localized regime, Tc decreases linearly with decreasing Mo concentration from 7.5 K (78 at Mo) at a rate of 0.18 K/at % Mo. In this region the ratio of electron-phonon coupling constant Lambda to the bare density of states Mb (0) is constant, which is consistent with the Varma- Dynes tight-binding model. An extrapolation of the linear behavior of Tc in this regime yields the disappearance of Tc near 35 at Mo. However, measurements show that Tc exists down to 13.5 at Mo. A non-superconducting metallic phase is found to exist between 13.5 at 10.4 at Mo at which concentration the insulating phase occurs.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1985
- Accession Number
- ADA224380
Entities
People
- Theodore H. Geballe
Organizations
- Stanford University