Characterization of the Thermal Properties of Ir/Pt Bilayer Transition Edge Sensors

Zhang, J.; Chang, C. L.; Fujikawa, B.; Karapetrov, G.; Kolomensky, Yu. G.; Kwok, W. -K.; Lisovenko, M.; Novosad, V.; Pearson, J. E.; Singh, V.; Wang, G.; Welliver, B.; Welp, U.; Yefremenko, V. G.

doi:10.1007/s10909-022-02811-y

Characterization of the Thermal Properties of Ir/Pt Bilayer Transition Edge Sensors

Journal Article · Mon Sep 05 00:00:00 EDT 2022 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/s10909-022-02811-y· OSTI ID:1891876

Zhang, J. ^[1]; Chang, C. L. ^[2]; Fujikawa, B. ^[3]; Karapetrov, G. ^[4]; Kolomensky, Yu. G. ^[5]; Kwok, W. -K. ^[1]; Lisovenko, M. ^[1]; Novosad, V. ^[1]; Pearson, J. E. ^[1]; Singh, V. ^[6]; Wang, G. ^[1]; Welliver, B. ^[5]; Welp, U. ^[1]; Yefremenko, V. G. ^[1]

Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Chicago, IL (United States). Kavli Inst. for Cosmological Physics (KICP)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Drexel Univ., Philadelphia, PA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States)

In this work, we are developing a low-T_c TES-based large-area and low-threshold detector targeting a variety of potential applications. The detector consists of a 50.8-mm-diameter Si wafer as the substrate and radiation absorber, a single Ir/Pt bilayer TES sensor in the center, and normal metal Au pads added to the TES to strengthen the TES–absorber thermal coupling. Tight TES–absorber thermal coupling improves detector sensitivity and response uniformity. Here, we report on the electron–phonon (e–ph) coupling strengths for the Ir/Pt bilayer and Au that are measured with our prototype detectors and TES devices. We found that a second weak thermal link besides the one due to e–ph coupling in Ir/Pt or Au was required to explain our data. With the effects of the second weak link accounted for, the extracted e–ph coupling constant Σ for Ir/Pt bilayer in the T_c range between 32 and 70 mK is 1.9×10⁸ WK^-5m^-3, and Σ’s for Au at 40 mK and 55 mK are 2.2×10⁹ WK^-5m^-3 and 3.2×10⁹ WK^-5m^-3, respectively.

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-05CH11231; AC02-06CH11357; FG02-00ER41138

OSTI ID:: 1891876

Alternate ID(s):: OSTI ID: 1969126

Journal Information:: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 1-2 Vol. 210; ISSN 0022-2291

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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