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
DOI 10.1103/PhysRevLett.102.247003 · Physical Review Letters
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Au Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | onset |
| Au Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.05 | Pressure not reported | zero_resistance |
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