Multiple Andreev reflection in single atom niobium junctions

Details Multiple Andreev reflection in single atom niobium junctions Multiple Andreev reflection in single atom niobium junctions

1999-08-16

arxiv.org/abs/cond-mat/9908223v1

Phys. Rev. B 61, 8561 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages; submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.61.8561

Single atom junctions between superconducting niobium leads are produced using the Mechanically Controllable Break Junction technique. The current-voltage characteristics of these junctions are analysed using an exact formulation for a superconducting quantum point contact. For tunnelling between two single atoms with a sufficiently large vacuum barrier, it is found that a single channel dominates the current, and that the current-voltage characteristic is described by the theory, without adjustable parameters. For a contact of a single Nb atom it is shown that five conductance channels contribute to the conductance, in agreement with the number expected based on the number of valence orbitals for this d-metal. For each of the channels the transmission probability is obtained from the fits and the limits of accuracy for these numbers are discussed.

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