التفاصيل البيبلوغرافية
| العنوان: |
Impact of Electrical Contacts Design and Materials on the Stability of Ti Superconducting Transition Shape. |
| المؤلفون: |
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. |
| المصدر: |
Journal of Low Temperature Physics; Dec2018, Vol. 193 Issue 5/6, p732-738, 7p |
| مصطلحات موضوعية: |
ELECTRIC contacts, SUPERCONDUCTING transitions, TELESCOPES, ATOMIC force microscopes, DIFFUSION barriers |
| مستخلص: |
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. [ABSTRACT FROM AUTHOR] |
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