Semiconductor-superconductor transition and magnetoresistance terraces in an ultrathin superconducting Pb nanobridge

Jian Wang, Jin-Feng Jia, Xu-Cun Ma, Quan-Tong Shen, Tie-Zhu Han, Ai-Zi Jin, Li Lu, Chang-Zhi Gu, Ming-Liang Tian, X. C. Xie, Qi-Kun Xue
2010 Journal of Vacuum Science and Technology B:Nanotechnology and Microelectronics  
Using focused ion beam etching technique, the authors fabricated a 28 atomic monolayers thick, 500 nm wide, and 10 m long Pb nanobridge from an atomically flat Pb thin film grown on Si by molecular beam epitaxy. Electric transport measurements show exotic resistance oscillations in the superconducting state far below its critical field H C and cascading terraces near the superconducting transition region. Furthermore, the bridge shows an unusual semiconducting behavior above the superconducting
more » ... the superconducting transition temperature T C . The results are in contrast to those observed in its counterpart of the two-dimensional thin film.
doi:10.1116/1.3437016 fatcat:a6knt65dcnhgtewuuklvyetbne