Cascaded superconducting junction refrigerators: Optimization and performance limits

A. Kemppinen (Corresponding Author), A. Ronzani, E. Mykkänen, J. Hätinen, J. S. Lehtinen, M. Prunnila

Research output: Contribution to journalArticleScientific

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Abstract

We demonstrate highly transparent vanadium-silicon and aluminium-silicon tunnel junctions, where silicon is doped to remain conducting even in cryogenic temperatures. We discuss using them in a cascaded electronic refrigerator with two or more refrigeration stages, and where different superconducting gaps are needed for different temperatures. The optimization of the whole cascade is a multidimensional problem, but we present an approximative optimization criterion that can be used as a figure of merit for a single stage only.
Original languageEnglish
Number of pages5
JournalarXiv preprint
Publication statusPublished - 29 Sep 2020
MoE publication typeB1 Article in a scientific magazine

Keywords

  • cond-mat.supr-con

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