Low Temperature Characteristics of the Metal–Superconductor NIS Tunneling Thermometer

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2022-05
Major/Subject
Mcode
Degree programme
Language
en
Pages
6
220-225
Series
Journal of Low Temperature Physics, Volume 207, issue 3-4
Abstract
We discuss the temperature dependence of a common low temperature local thermometer, a tunnel junction between a superconductor and a normal metal (NIS junction). Towards the lowest temperatures its characteristics tend to saturate, which is usually attributed to selfheating effects. In this technical note, we reanalyze this saturation and show that the temperature independent subgap current of the junction alone explains in some cases the low temperature behavior quantitatively.
Description
Funding Information: We received funding from the Academy of Finland under Grant 312057. We acknowledge the provision of facilities and technical support by Aalto University at the OtaNano—Micronova Nanofabrication Center and through the low temperature laboratory (LTL) infrastructure, which is part of the EU Horizon 2020 European Microkelvin Platform (EMP), No. 824109. Publisher Copyright: © 2022, The Author(s).
Keywords
Dynes parameter, Local thermometry, Low-T saturation, NIS junction
Other note
Citation
Karimi , B , Chang , Y C & Pekola , J P 2022 , ' Low Temperature Characteristics of the Metal–Superconductor NIS Tunneling Thermometer ' , Journal of Low Temperature Physics , vol. 207 , no. 3-4 , pp. 220-225 . https://doi.org/10.1007/s10909-022-02713-z