Abstract
Study of the electrical conductances of a series of ultrathin Bi films as a function of increasing thickness has revealed behavior which can be correlated with the onset of superconductivity, even in the insulating state. The conductances of these films scale empirically with a single parameter which falls to zero when the films become superconductive. These observations suggest a direct transition between insulating and superconducting behavior. This transition occurs at a normal-state sheet resistance close to the quantum resistance for pairs, Rq=h/4e2.
Original language | English (US) |
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Pages (from-to) | 2068-2071 |
Number of pages | 4 |
Journal | Physical review letters |
Volume | 67 |
Issue number | 15 |
DOIs | |
State | Published - 1991 |