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TT: Fachverband Tiefe Temperaturen

TT 36: TR: Poster Session

TT 36.1: Poster

Donnerstag, 25. März 2010, 14:00–18:00, Poster A

Lithographically fabricated mechanically controlled break junctions (MCBJ) made of Platinum — •Florian Strigl, Reimar Waitz, and Elke Scheer — Department of Physics, University of Konstanz, 78475 Konstanz, Germany

We present the fabrication scheme and electrical transport properties of lithographically fabricated platinum break junctions for adjusting atomic-size platinum contacts. Platinum atomic contacts are interesting for contacting individual molecules [1] as well as for studying photo-assisted transport [2, 3]. Because of the high melting point of platinum the standard electron beam lithography process for lithographic MCBJs [4] cannot be applied, but a procedure using subtractive dry etching of the platinum layer has to be used. We present here the first electronic transport properties of atomic size contacts produced from these MCBJs under ambient conditions as well as at cryogenic vacuum. We study the conductance as a function of the contact size and calculate histograms from these data. Furthermore we study the current-voltage characteristics of single-atom contacts. Our preliminary data yields a preferred conductance of the single-atom contact in the order of 1.6 to 2 G₀ in agreement with results obtained on "classical" MCBJs [5].

[1] Nature 419 (2002) 906

[2] Phys. Rev. Lett. 99 (2007) 086801

[3] Phys. Rev. B 75 (2007) 075406

[4] Rev. Sci. Instrum. 67 (1996) 108-11,

[5] Phys. Rev. B, 67 (2003) 245411