Abstract
We report systematic magnetotransport measurements on a series of in situ grown homogeneous amorphous Pb wires. Corresponding to the broadening of the superconducting transitions as the wires cross over from 2D to 1D, we observe a negative magnetoresistance (MR) below the mean-field at low fields. Both the magnitude of the negative MR and the crossover field increase with decreasing and wire cross-sectional area. We speculate that these observations are the result of superfluid density fluctuations in sign as well as in magnitude along these wires close to the superconductor-insulator transition.
- Received 17 June 1996
DOI:https://doi.org/10.1103/PhysRevLett.78.927
©1997 American Physical Society