Abstract
A magnetic field tuned superconductor-insulator transition (SIT) in ultrathin PbBi/Ge films has been observed. Electron tunneling measurements in a magnetic field near the SIT show the presence of a large number of quasiparticle states near the Fermi energy. A simple analysis of these data shows that the average number of Cooper pairs in a coherence volume is on the order of 1 at the SIT. Combined with transport measurements, the data imply that strong fluctuations in the amplitude of the superconducting order parameter occur at this field tuned SIT.
| Original language | English |
|---|---|
| Pages (from-to) | 132-135 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 75 |
| Issue number | 1 |
| DOIs | |
| State | Published - 1 Jan 1995 |