Josephson junction based thermometer and its application in bolometry
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Journal of Applied Physics, Volume 116, Issue 9
AbstractWe propose a new type of a transition edge sensor based on an Al/AlOx/Ti/AlOx/Al superconductor—insulator—superconductor—insulator—superconductor (SIS'IS) structure. It exhibits sharp dependence of zero bias resistance on temperature of the titanium absorber in the vicinity of its superconducting critical temperature. We demonstrate temperature sensitivity of the device to be 2 μK/√Hz. Noise Equivalent Power (NEP) of the device, limited by the amplifier noise, is estimated to be 4×10−17 W/√Hz at 313 mK. The tunnel junctions between superconducting leads should help to overcome the size limitation imposed by proximity effect in conventional transition edge sensors, without sacrificing the sensitivity. Besides that the input resistance of the device can be tuned in a wide range.
thermometers, Josephson junctions, aluminium, titanium, superconductors, superconducting detectors, electrical resistivity
Faivre, T. & Golubev, D. & Pekola, Jukka. 2014. Josephson junction based thermometer and its application in bolometry. Journal of Applied Physics. Volume 116, Issue 9. 094302/1-5. ISSN 0021-8979 (printed). DOI: 10.1063/1.4894516.