Low Temperature Characteristics of the Metal–Superconductor NIS Tunneling Thermometer

Bayan Karimi; Yu Cheng Chang; Jukka P. Pekola

doi:10.1007/s10909-022-02713-z

Low Temperature Characteristics of the Metal–Superconductor NIS Tunneling Thermometer

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

^*Corresponding author for this work

University of Helsinki

Research output: Contribution to journal › Article › Scientific › peer-review

2 Citations (Scopus)

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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 language	English
Pages (from-to)	220-225
Number of pages	6
Journal	Journal of Low Temperature Physics
Volume	207
Issue number	3-4
Early online date	5 Apr 2022
DOIs	https://doi.org/10.1007/s10909-022-02713-z
Publication status	Published - May 2022
MoE publication type	A1 Journal article-refereed

Keywords

Dynes parameter
Local thermometry
Low-T saturation
NIS junction

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10.1007/s10909-022-02713-zLicence: CC BY

Low Temperature Characteristics of the Metal–Superconductor NIS Tunneling ThermometerFinal published version, 709 KBLicence: CC BY

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title = "Low Temperature Characteristics of the Metal–Superconductor NIS Tunneling Thermometer",

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.",

keywords = "Dynes parameter, Local thermometry, Low-T saturation, NIS junction",

author = "Bayan Karimi and Chang, {Yu Cheng} and Pekola, {Jukka P.}",

note = "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: {\textcopyright} 2022, The Author(s).",

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doi = "10.1007/s10909-022-02713-z",

language = "English",

volume = "207",

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AU - Karimi, Bayan

AU - Chang, Yu Cheng

AU - Pekola, Jukka P.

N1 - 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).

PY - 2022/5

Y1 - 2022/5

N2 - 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.

AB - 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.

KW - Dynes parameter

KW - Local thermometry

KW - Low-T saturation

KW - NIS junction

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EP - 225

JO - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

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ER -

Low Temperature Characteristics of the Metal–Superconductor NIS Tunneling Thermometer

Abstract

Keywords

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QTF: Finnish Centre of Excellence in Quantum Technology

OtaNano

OtaNano – Low Temperature Laboratory

OtaNano - Nanofab

Cite this

Low Temperature Characteristics of the Metal–Superconductor NIS Tunneling Thermometer

Abstract

Keywords

Access to Document

OpenUrl availability

Other files and links

Fingerprint

Projects

QTF: Finnish Centre of Excellence in Quantum Technology

Equipment

OtaNano

OtaNano – Low Temperature Laboratory

OtaNano - Nanofab

Cite this