Abstract
A microwave kinetic inductance detector (MKID) is a superconducting pair breaking detector that offers a number of unique advantages for realizing large-format arrays of ultra-sensitive detectors, such as inherent multiplexibility and relative ease of fabrication. With the detection threshold being set by the Cooper pair binding energy, and correspondingly, the superconducting critical temperature (\(T_\mathrm{c}\)), typically well-understood MKID materials such as aluminum (Al) present a lower limit on the operating frequency. Aluminum manganese (Al-Mn) is a promising candidate material for MKIDs because it can be fabricated with nearly identical processing as pure Al, but allows for control of the \(T_\mathrm{c}\) with varying levels of Mn doping or post-deposition heat treatment. We present initial results from an early characterization of AlMn using a series of lumped-element superconducting microwave resonators, including measurements of \(T_\mathrm{c}\), internal quality factor, and noise performance over a range of Mn doping.
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Acknowledgements
Work at Argonne, including the use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences and Office of High Energy Physics, under Contract No. DE-AC02-06CH11357. Zhaodi Pan is supported by ANL under award LDRD-2021-0186.
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Lisovenko, M., Pan, Z., Barry, P.S. et al. Characterization of the Superconducting Microwave Properties of Aluminum Manganese. J Low Temp Phys 209, 1158–1164 (2022). https://doi.org/10.1007/s10909-022-02845-2
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DOI: https://doi.org/10.1007/s10909-022-02845-2