Abstract
Superconductivity has been induced in insulating ultrathin films of amorphous bismuth using the electric field effect. The screening of the electron-electron interaction was found to increase with electron concentration in a manner correlated with the tendency towards superconductivity. This does not preclude an increase in the density of states being important in the development of superconductivity. The superconductor-insulator transition appears to belong to the universality class of the three dimensional XY model.
Original language | English (US) |
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Article number | 197004 |
Journal | Physical review letters |
Volume | 94 |
Issue number | 19 |
DOIs | |
State | Published - May 20 2005 |