Effects of Normal Metal Features on Superconducting Transition-Edge Sensors

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https://link.springer.com/article/10.1007/s10909-018-1898-z

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https://doi.org/10.1007/s10909-018-1898-z
 http://hdl.handle.net/11603/24032

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Faculty Collection
UMBC Physics Department

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Author/Creator ORCID

https://orcid.org/0000-0001-8397-9338
 https://orcid.org/0000-0003-0622-5174
 https://orcid.org/0000-0002-9247-3010
 https://orcid.org/0000-0003-4096-4675

Date

2018-04-02

Type of Work

journal articles
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Citation of Original Publication

Wakeham, N.A., Adams, J.S., Bandler, S.R. et al. Effects of Normal Metal Features on Superconducting Transition-Edge Sensors. J Low Temp Phys 193, 231–240 (2018). https://doi.org/10.1007/s10909-018-1898-z

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

In transition-edge sensors (TESs), the addition of normal metal stripes on top of the superconducting bilayer, perpendicular to the current direction, is known to globally alter the sensitivity of the resistance R to changes in temperature T and current I. Here, we describe measurements of the dependence of the TES current on magnetic field B, bath temperature and voltage bias in devices with various numbers of stripes. We show that the normal metal features have a profound effect on the appearance of localized regions of very large (T/R) dR/dT . We associate this with changes in the current distribution and corresponding changes in the oscillatory pattern of I(B). 140 µm TESs with no stripes are found to have a relatively smooth resistive transition and sufficiently low noise that the measured energy resolution is 1.6 eV for X-rays of 1.5 keV. The predicted energy resolution at 6 keV is better than 2 eV, once the heat capacity is optimized for these higher energies.