Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 38: Poster Session Transport

TT 38.12: Poster

Wednesday, March 16, 2011, 14:00–18:00, P3

Magneto-resistance Measurements on Atomic Platinum Chains — •Christopher Espy, Florian Strigl, and Elke Scheer — Department of Physics, University of Konstanz, 78457 Konstanz, Germany

Recently there have been many theoretical predictions that platinum, nonmagnetic in bulk, is indeed magnetic in nanostructures [1][2]. How and when this magnetism manifests is still a point of discussion [3]. Preliminary experiments investigating magnetic effects in nanostructures of various metals have been performed, however conclusive evidence confirming previous theoretical predictions regarding magnetism in platinum nanostructures has yet to be found [4].

In this contribution we present the study of suspended monatomic platinum nanowires, fabricated using the mechanically controllable break junction technique. Various experiments are carried out at low temperatures, T < 4.2 K, and under cryogenic vacuum conditions, including the generation of conductance histograms, magneto-resistance investigations, and study of the current-voltage characteristics of the nanostructures. We find strong chain length-dependent magneto-resistive effects of considerable magnitude, up to 25%.
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