Nanosized Superconducting Constrictions in High Magnetic Fields
Nanowires of lead between macroscopic electrodes can be produced experimentally by means of an STM. Magnetic fields higher than the critical field of the bulk may destroy the superconductivity in the electrodes, while the wire remains in the superconducting state. The I-V characteristics can be described in terms of an effective gap and a pair breaking parameter, which depends on the field. The evolution of the order parameter, the density of states and the transport properties, as function of the applied field are experimentally and theoretically analyzed.
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