Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 13: Transport: Poster Session
TT 13.20: Poster
Monday, March 26, 2012, 15:00–19:00, Poster B
Electric transport and tunnel measurements on pure copper nanowires — •Maksym Kompaniiets1, Dirk Klingenberger1, Fabrizio Porrati1, Oleksandr Dobrovolskiy1, Oleksandr Foyevtsov1, Cornelia Neetzel2, Markus Rauber2, Maria Eugenia Toimil-Molares3, Wolfgang Ensinger2, Christina Trautmann3, and Michael Huth1 — 1Physikalisches Institut, Goethe Universität, Frankfurt a. M. — 2Fachbereich Materialwissenschaften, TU Darmstadt, Darmstadt — 33GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt
Cu and Cu/Fe nanowires of well-defined shape and composition are well-suited for studying the spin-dependent scattering resistance contribution of ferromagnets and Kondo systems. We present first four-probe ac-resistance and tunnel measurements on cross-type junctions of individual nanowires with diameters of about 250 − 300 nm and length of about 30 − 60 µ m. The nanowires have been prepared by electrochemical deposition in etched heavy-ion-track polycarbonate membranes (templates). For contacting individual nanowires ion beam induced deposits of W−Ca−Ga−O electrodes with the precursor gas W(CO)6 in a dual-beam SEM/FIB were used. Electric transport measurements on pure Cu nanowires reveal a decreasing resistivity with decreasing temperature, as is expected for metallic nanowires. Furthermore, in tunneling spectroscopy measurements we found clear indications of proximity-effect induced superconductivity in the Cu nanowires below 5 K, i.e. the critical temperature of the W−C−Ga−O composites electrodes.