Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 46: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs 2
TT 46.4: Talk
Thursday, March 29, 2012, 18:30–18:45, H 2053
Single crystal gold nanowire Josephson junctions and superconducting quantum interference devices — •Yusuf H. Günel1,2, Nick Borgwardt1,2, Huijun Yao3, 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, Aachen, Germany
We have used single crystal Au nanowires, grown by electrochemical deposition method, contacted by two Niobium (Nb) superconducting material to form a Josephson junction. The fabricated devices have been characterized in a filtered 3He cryostat in a temperature range from 0.3 K up to 6 K as well as a magnetic field up to 7 T. The critical current of the Josephson devices has been investigated as a function of temperature and magnetic field. Furthermore, we have observed clear sub-harmonic gap structures in the differential resistance measurements, indicating multiple Andreev reflection.
As an important application of Josephson junctions, we have also fabricated and characterized the properties of superconducting quantum interference devices (SQUIDs) formed by two individual Nb/Au-nanowire/Nb Josephson junctions.