Multiple Andreev reflection in single-atom niobium junctions
Physical Review B - Condensed Matter and Materials Physics, ISSN: 1550-235X, Vol: 61, Issue: 12, Page: 8561-8569
2000
- 67Citations
- 28Captures
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Article Description
Single-atom junctions between superconducting niobium leads are produced using the mechanically controllable break junction technique. The current-voltage characteristics of these junctions are analyzed using an exact formulation for a superconducting quantum point contact. For tunneling 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 of these numbers are discussed. © 2000 The American Physical Society.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0001122328&origin=inward; http://dx.doi.org/10.1103/physrevb.61.8561; https://link.aps.org/doi/10.1103/PhysRevB.61.8561; http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.61.8561/fulltext; http://link.aps.org/article/10.1103/PhysRevB.61.8561
American Physical Society (APS)
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