Abstract
We investigate whether unintentionally applied currents may have induced the previously reported resistive and current-voltage characteristic anomalies near the superconducting transition temperature in quasi-one-dimensional aluminum lines. Our samples show no intrinsic anomalies, but a low frequency current deliberately added to the ordinary measuring current induces a resistive peak near the transition. Additional a.c. current applied to the voltage leads instead of the current leads induces an excess voltage peak near the critical current in V(I) curves. The resistive peak near the transition results from mixing, but we cannot explain the voltage peak by a simple mixing analysis. The similarity of the resistive and V(I) peaks to previous observations suggests possible extrinsic effects in earlier work.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 575-580 |
| Number of pages | 6 |
| Journal | Superlattices and Microstructures |
| Volume | 20 |
| Issue number | 4 |
| DOIs | |
| State | Published - 1996 |
Funding
Acknowledgements—Work at Northwestern University has been supported by the NSF under grant DMR-9357506, the Materials Research Center at Northwestern University under NSF-DMR-9120521, and the Sloan and Packard Foundations. Work at K. U. Leuven has been supported by the Belgian National Fund for Scientific Research (NFWO) as well as by the Belgian Inter-University Attraction Poles (IUAP) and the Flemish Concerted Action (GOA) programs. Travel between Evanston and Leuven was made possible by a NATO Collaboration Research Grant.
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Electrical and Electronic Engineering