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Nonequilibrium effects in superconducting necks of nanoscopic dimensions

H. Suderow, S. Vieira

cond-mat.mes-hallarXiv:cond-mat/0009127

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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