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Impact of electrical contacts design and materials on the stability of Ti superconducting transition shape

Yefremenko, Volodymyr, Ade, Peter A. R., Ahmed, Zeeshan, Anderson, Adam J., Austermann, Jason E., Avva, Jessica S., Basu Thakur, Robitan, Bender, Amy N., Benson, Bradford A., Carlstrom, John E., Carter, Faustin W., Cecil, Thomas, Chang, Clarence L., Cliche, Jean-Francois, Cukierman, Ariel, Denison, Edward V., de Haan, Tijmen, Ding, Junjia, Divan, Ralu N. S., Dobbs, Matt A., Dutcher, Daniel, Everett, Wenderline, Foster, Allen, Gannon, Renae N., Gilbert, Adam, Groh, John, Halverson, Nils W., Harke-Hosemann, Angelina H., Harrington, Nicholas L., Henning, Jason W., Hilton, Gene C., Holzapfel, William L., Huang, Nicholas, Irwin, Kent D., Jeong, Oliver B., Jonas, Michelle, Khaire, Trupti, Kofman, Anna M., Korman, Milo, Kubik, Donna L., Kuhlmann, Steve, Kuo, Chao-Lin, Lee, Adrian T., Lowitz, Amy E., Meyer, Stephen S., Michalik, Daniel, Miller, Christina Suzanne, Montgomery, Joshua, Nadolski, Andrew, Natoli, Tyler J., Nguyen, Hogan, Noble, Gavin, Novosad, Valentine, Padin, Stephen, Pan, Zhaodi, Pearson, John, Posada, Chrystian M., Rahlin, Alexandra, Ruhl, John E., Saunders, L. J., Sayre, James T., Shirley, Ian, Shirokoff, Erik D., Smecher, Graeme, Sobrin, Joshua A., Stan, Liliana, Stark, Antony A., Story, Kyle T., Suzuki, Aritoki, Tang, Qing Yang, Thompson, Keith L., Tucker, Carole E., Vale, Leila R., Vanderlinde, Keith, Vieira, Joaquin D., Wang, Gensheng, Whitehorn, Nathan, Yoon, Ki Won and Young, Matt 2018. Impact of electrical contacts design and materials on the stability of Ti superconducting transition shape. Journal of Low Temperature Physics 10.1007/s10909-018-2040-y

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The South Pole Telescope SPT-3G camera utilizes Ti/Au transition edge sensors (TESs). A key requirement for these sensors is reproducibility and long-term stability of the superconducting (SC) transitions. Here, we discuss the impact of electrical contacts design and materials on the shape of the SC transitions. Using scanning electron microscope, atomic force microscope, and optical differential interference contrast microscopy, we observed the presence of unexpected defects of morphological nature on the titanium surface and their evolution in time in proximity to Nb contacts. We found direct correlation between the variations of the morphology and the SC transition shape. Experiments with different diffusion barriers between TES and Nb leads were performed to clarify the origin of this problem. We have demonstrated that the reproducibility of superconducting transitions can be significantly improved by preventing diffusion processes in the TES–leads contact areas.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Publisher: Springer Verlag (Germany)
ISSN: 0022-2291
Date of First Compliant Deposit: 6 September 2018
Date of Acceptance: 20 July 2018
Last Modified: 17 Oct 2019 21:23

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