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

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11 Author(s)
Wang, Jian ; International Center for Quantum Materials, Peking University, Beijing 100871, China; Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; and Department of Physics and The Center for Nanoscale Science, The Pennsylvania State University, University Park, Pennsylvania 16802-6300 ; Jia, Jin-Feng ; Ma, Xu-Cun ; Shen, Quan-Tong
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Using focused ion beam etching technique, the authors fabricated a 28 atomic monolayers thick, 500 nm wide, and 10 μm 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 HC and cascading terraces near the superconducting transition region. Furthermore, the bridge shows an unusual semiconducting behavior above the superconducting transition temperature TC. The results are in contrast to those observed in its counterpart of the two-dimensional thin film.

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Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures  (Volume:28 ,  Issue: 4 )