Proximity-induced superconductivity in nanowires: Minigap state and differential magnetoresistance oscillations

Jian Wang, Chuntai Shi, Mingliang Tian, Qi Zhang, Nitesh Kumar, J. K. Jain, T. E. Mallouk, M. H.W. Chan

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

We study proximity-induced superconductivity in gold nanowires as a function of the length of the nanowire, magnetic field, and excitation current. Short nanowires exhibit a sharp superconducting transition, whereas long nanowires show nonzero resistance. At intermediate lengths, however, we observe two sharp transitions; the normal and superconducting regions are separated by what we call the minigap phase. Additionally, we detect periodic oscillations in the differential magnetoresistance. We suggest that the minigap phase as well as the periodic oscillations originate from a coexistence of proximity-induced superconductivity with a normal region near the center of the wire, created either by temperature or the application of a magnetic field.

Original languageEnglish (US)
Article number247003
JournalPhysical Review Letters
Volume102
Issue number24
DOIs
StatePublished - Jun 19 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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