Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session
TT 33.50: Poster
Mittwoch, 28. März 2012, 15:00–19:00, Poster B
Supercurrent in Nb/Au-nanowire/Nb Josephson junctions — •Nick Borgwardt1,2, Yusuf H. Günel1,2, Huijun Yao1,3, Gregor Panaitov4, Detlev Grützmacher1,2, and Thomas Schäpers1,2,5 — 1Peter Grünberg Institute -9, Forschungszentrum Jülich, 52425 Jülich, Germany — 2JARA-Fundamentals of Future Information Technology — 3Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People’s Republic of China — 4Peter Grünberg Institute -8, Forschungszentrum Jülich, 52425 Jülich, Germany — 5II. Physikalisches Institut, RWTH Aachen University,52056 Aachen, Germany
Josephson junctions and SQUIDs were fabricated using single crystalline gold nanowires (NWs), grown by electrochemical deposition. The diameter of the NWs ranged from 80 to 140nm with a length of several µm. Devices with an electrode distance ranging from 80 to 300nm were fabricated by electron beam lithography and subsequent Nb sputtering.
Electrical measurements were carried out in a 3He cryostat at temperatures between 0.3 and 6K. From the current-voltage characteristics of the junctions a critical current as high as Ic 60µA at 0.4K was deduced. Measurements of the critical current depending on temperature and magnetic field give insights into the fundamental transport properties. Analyzing the differential resistance we observed pronounced sub-gap peaks which we assigned to Andreev reflections.