Development of an inductive NIS thermometer

Normal metal-Insulator-Superconductor (NIS) tunnel junction thermometers have been under heavy research since 1976 after Rowell and Tsui first presented thanks to their excellent sensitivity to the temperature change in millikelvin regime. In this work, we have designed and studied an inductive read...

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Main Author: Geng, Zhuoran
Other Authors: Matemaattis-luonnontieteellinen tiedekunta, Faculty of Sciences, Fysiikan laitos, Department of Physics, University of Jyväskylä, Jyväskylän yliopisto
Format: Master's thesis
Language:eng
Published: 2012
Subjects:
Online Access: https://jyx.jyu.fi/handle/123456789/37288
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author Geng, Zhuoran
author2 Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Fysiikan laitos Department of Physics University of Jyväskylä Jyväskylän yliopisto
author_facet Geng, Zhuoran Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Fysiikan laitos Department of Physics University of Jyväskylä Jyväskylän yliopisto Geng, Zhuoran Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Fysiikan laitos Department of Physics University of Jyväskylä Jyväskylän yliopisto
author_sort Geng, Zhuoran
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description Normal metal-Insulator-Superconductor (NIS) tunnel junction thermometers have been under heavy research since 1976 after Rowell and Tsui first presented thanks to their excellent sensitivity to the temperature change in millikelvin regime. In this work, we have designed and studied an inductive readout for NIS tunnel junctions by using on-chip planar inductors and a DC SQUID (Superconducting Quantum Interference Device) to develop a sensitive and fast thermometer for studies of nanoscale heat conduction and bolometry. In this thesis, the processing of the samples fabricated in Nanoscience Center in Jyväskylä are presented, and several processing challenges have been dealt with and the fabrication recipe is discussed in detail. Two measurements were performed on our sample, one with a normal DC measurement setup, and the other with a AC bias and SQUID read-out setup. Our initial results indicates that the SQUID measurement follows well the DC bias measurement and the BCS theory for the SINIS junction, and shows that it is feasible to use this scheme to directly measure the conductance of a SINIS device at audio frequencies with a good sensitivity for temperatures below 1 K for aluminum as the superconductor when voltage biased close to the superconductor energy gap.
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spellingShingle Geng, Zhuoran Development of an inductive NIS thermometer NIS tunnel junction Fysiikka Physics 4021 lämpömittarit
title Development of an inductive NIS thermometer
title_full Development of an inductive NIS thermometer
title_fullStr Development of an inductive NIS thermometer Development of an inductive NIS thermometer
title_full_unstemmed Development of an inductive NIS thermometer Development of an inductive NIS thermometer
title_short Development of an inductive NIS thermometer
title_sort development of an inductive nis thermometer
title_txtP Development of an inductive NIS thermometer
topic NIS tunnel junction Fysiikka Physics 4021 lämpömittarit
topic_facet 4021 Fysiikka NIS Physics lämpömittarit tunnel junction
url https://jyx.jyu.fi/handle/123456789/37288 http://www.urn.fi/URN:NBN:fi:jyu-201201301102
work_keys_str_mv AT gengzhuoran developmentofaninductivenisthermometer