Abstract
Dynamical studies of Bi ultrathin films prepared on carbon at 100 K exhibit a phase transition from nanocrystalline to amorphouslike clusters. Evidence for the transition at a thickness of 8 is provided by the form, intensity, and polarization dependence of in situ Raman-scattering measurements in ultrahigh vacuum. A substantial increase in frequency of the opticlike band with decreasing thickness indicates increased covalent interactions. This contrasts with superconducting Bi films, suggesting a semiconducting amorphous state in clusters.
| Original language | English |
|---|---|
| Pages (from-to) | 875-878 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 67 |
| Issue number | 7 |
| DOIs | |
| State | Published - 1991 |
| Externally published | Yes |