Nonequilibrium effects in superconducting necks of nanoscopic dimensions
H. Suderow, S. Vieira
Abstract
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 ΛQ* and the length of the neck which is superconducting under field.
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