Abstract
The onset of superconductivity in homogeneous ultrathin films is found to occur when their normal-state sheet resistance falls below a value close to h/4e2, the quantum resistance for pairs. The data further suggest that in the T 0 limit such films are either superconducting or insulating. The existence of a threshold in systems which are not granular implies that its explanation involves more general arguments than those which follow from the modeling of films by Josephson-coupled arrays.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2180-2183 |
| Number of pages | 4 |
| Journal | Physical review letters |
| Volume | 62 |
| Issue number | 18 |
| DOIs | |
| State | Published - 1989 |