Conduction channels of superconducting quantum point contacts

Details Conduction channels of superconducting quantum point contacts Conduction channels of superconducting quantum point contacts

2000-01-25

arxiv.org/abs/cond-mat/0001356v1

Physics

Condensed Matter

Superconductivity

8 pages, 5 .eps figures. To be published in Physica B 223

Scientific paper

10.1016/S0921-4526(99)01812-8

Atomic quantum point contacts accommodate a small number of conduction channels. Their number N and transmission coefficients {T_n} can be determined by analyzing the subgap structure due to multiple Andreev reflections in the current-voltage (IV) characteristics in the superconducting state. With the help of mechanically controllable break-junctions we have produced Al contacts consisting of a small number of atoms. In the smallest stable contacts, usually three channels contribute to the transport. We show here that the channel ensemble {T_n} of few atom contacts remains unchanged up to temperatures and magnetic fields approaching the critical temperature and the critical field, respectively, giving experimental evidence for the prediction that the conduction channels are the same in the normal and in the superconducting state.

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