An unusual enhancement of resistance (i.e., a "superresistivity") below a certain characteristic temperature Tsr was observed in granular Bi nanowires. This "superresistive" state was found to be dependent on the applied magnetic field as well as the excitation current. The suppression of Tsr by magnetic field resembles that of a superconductor. The observed superresistivity appears to be related to the nucleation of local superconductivity inside the granular nanowire without long-range phase coherence. The phenomenon is reminiscent of the "Cooper-pair insulator" observed previously in ultrathin two-dimensional superconducting films and three-dimensional percolative superconducting films.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Jul 16 2008|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics