Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Transport: Poster Session

TT 22.34: Poster

Mittwoch, 27. Februar 2008, 14:00–18:00, Poster B

Reversible Switching Effect in Atomic-Size Contacts — •Christian Schirm, Hans-Fridtjof Pernau, and Elke Scheer — University of Konstanz, Department of Physics, 78457 Konstanz, Germany

We investigate electromigration effects in atomic-size contacts of aluminum fabricated with the mechanically controllable break junction technique at T≤1.5K. We observe current-driven conductance changes Δ G and analyze their influence on the conductance histogram. In particular situations a reversible switching between two conductance values is observed (>100 repetitions) which attribute to the formation of preferred atomic configurations. A correlation between these configurations and conductance channels shall be established via the analysis of MAR in the superconducting state [1].

[1] E. Scheer et al., Phys. Rev. Lett. 78 (1997) 3535-3538