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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.36: Poster

Donnerstag, 17. März 2011, 10:00–13:00, P1

Tunnel-spectroscopy of tunable granular metals prepared by focused electron beam induced deposition — •Dirk Klingenberger, Fabrizio Porrati, and Michael Huth — Physikalisches Institut, Goethe-Universität, Max-von-Laue-Str.1, D-60438 Frankfurt am Main

For the fabrication of platinum containing granular metals we used a focused electron beam and the precursor trimethyl-methyl-cyclopentadienyl-platinum injected into a vacuum chamber nearby the focal area of the beam. The granular metals are composed of platinum nanocrystallites, embedded in a carbonaceous matrix. Postgrowth electron irradiation manipulates the surrounding matrix and allows us - via the radiation dose - to fine tune the sample's conductivity from the insulating to the metallic regime. The deposits were written onto oxidized aluminum contacts to create planar tunnel junctions. Differential conductance measurements have been performed at different temperatures utilizing a He4 cryostat to investigate the sample's density of states. So the current theory of granular metals can be tested. Especially, the behavior of the Coulomb blockade was analyzed for the different conductivity regimes.