Low Temperature Characteristics of the Metal–Superconductor NIS Tunneling Thermometer

Bayan Karimi*, Yu Cheng Chang, Jukka P. Pekola

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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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.

Original languageEnglish
Pages (from-to)220-225
Number of pages6
JournalJournal of Low Temperature Physics
Volume207
Issue number3-4
Early online date5 Apr 2022
DOIs
Publication statusPublished - May 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • Dynes parameter
  • Local thermometry
  • Low-T saturation
  • NIS junction

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