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Publication Citation: Sub-100 mK cooling using normal-metal¿insulator¿superconductor tunnel junctions

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Author(s): Peter J. Lowell; Galen C. O\'Neil; Jason M. Underwood; Xiaohang Zhang; Joel N. Ullom;
Title: Sub-100 mK cooling using normal-metal¿insulator¿superconductor tunnel junctions
Published: December 15, 2013
Abstract: Normal-metal∖insulator∖superconductor (NIS) junctions can be used as solid-state refrigerators since the hottest electrons preferentially tunnel from the normal metal into the superconductor. In this paper, we present NIS junctions optimized to cool electrons from a bath temperature of 100 mK. We measure a temperature reduction of the electrons in the refrigerator junctions from 100 to 26 mK which agrees with device models. Independent measurements of the electron temperature using thermometer junctions measure a temperature decrease from 100 to 48 mK. Theories explaining the difference in measured temperatures are discussed.
Citation: Journal of Low Temperature Physics
Pages: 7 pp.
Keywords: Microrefrigerators,Superconducting tunnel junctions
Research Areas: Condensed Matter Physics, Superconductivity
DOI: http://dx.doi.org/10.1007/s10909-013-1009-0  (Note: May link to a non-U.S. Government webpage)
PDF version: PDF Document Click here to retrieve PDF version of paper (218KB)