Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 55: Poster Session: Superconductivity 2
TT 55.11: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P2-OG3
Electric transport and noise properties of Nb-HfTi-Nb Josephson Junctions — •Julian Linek1, Benedikt Müller1, Viacheslav Morosh2, Thomas Weimann2, Oliver Kieler2, Reinhold Kleiner1, and Dieter Koelle1 — 1Physikalisches Institut and Center for Quantum Science (CQ) in LISA+, Universität Tübingen, Germany — 2Fachbereich Quantenelektronik, Physikalisch-Technische Bundesanstalt, Braunschweig, Germany.
Nb-HfTi-Nb based superconductor-normal metal-superconductor (SNS) Josephson junctions offer high critical current density (> 105 A/cm2) and non hysteretic current-voltage characteristics, which makes them highly suitable for their use in strongly miniaturized nanoSQUIDs. The high sensitivity of nanoSQUIDs can e.g. be used to detect the magnetization reversal of individual magnetic nanoparticles. To optimize the sensitivity of the devices and for increasing the range of operation temperature and magnetic field, a detailed understanding of the properties of the Nb-HfTi-Nb junctions as a function of their size and operation temperature is essential. Here we present an experimental study of the electrical transport and noise properties of single Nb-HfTi-Nb junctions. In particular, we have investigated the scaling of the resistance, critical current and noise level of the junctions with temperature (down to 300 mK) and junction size (down to ∼ 100 nm). Simulations of the current-voltage characteristics based on the RCSJ model have been compared to the experimental results, to check whether this model is appropriate for the description of these SNS Josephson Junctions.