RESISTANCE ANOMALIES IN MESOSCOPIC SUPERCONDUCTING AL STRUCTURES

We show that the recently reported anomalous resistance peaks near the superconducting transition of quasi-one-dimensional mesoscopic Al str uctures can be induced by applying either radio-frequency radiation or a sufficiently high dc current. The nonmonotonic R(T) curves can be l inked to changes in the voltage-current characteristics below tile sup erconducting transition. The observed dependence on the position of th e voltage probes is consistent with recent theoretical calculations wh ich interpret the anomalies in terms of tile charge imbalance near pha se-slip centers created at specific spots on the sample.