Nonequilibrium effects in superconducting necks of nanoscopic dimensions

Details Nonequilibrium effects in superconducting necks of nanoscopic dimensions Nonequilibrium effects in superconducting necks of nanoscopic dimensions

2000-09-08

arxiv.org/abs/cond-mat/0009127v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 3 figures; to be published in Physics Letters A

Scientific paper

10.1016/S0375-9601(00)00587-9

We have fabricated superconducting connecting necks of Pb with a scanning tunneling microscope (STM) and studied their properties under magnetic fields near the transition to the resistive state. A striking phenomenology is found with two well defined conduction regimes as a function of the magnetic field. We discuss the possible origin of this behavior in terms of the interplay between the field dependence of the quasiparticle charge imbalance length $\Lambda_{Q*}$ and the length of the neck which is superconducting under field.

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