Superconductivity in single crystalline Pb nanowires contacted by normal metal electrodes

Details Superconductivity in single crystalline Pb nanowires contacted by normal metal electrodes Superconductivity in single crystalline Pb nanowires contacted by normal metal electrodes

2012-01-30

arxiv.org/abs/1201.6186v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

The transport properties of superconducting single crystal Pb nanowires of 55 nm and 70 nm diameter are studied by standard four electrodes method. Resistance-temperature (R-T) scans and magneto-resistance (R-H) measurements show a series of resistance steps with increasing temperature and magnetic field as the wires are brought toward the normal state. The resistance-current (R-I) scans at different temperature and magnetic field show that the increase in R with I is punctuated with sharp steps at specific current values. We interpret these steps as consequence of phase slip centers (PSCs) in the superconducting wires enhanced by the presence of the normal Pt electrodes.

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