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This article is cited in 4 scientific papers (total in 4 papers)
A superconducting resonator with a hafnium microbridge at temperatures of 50–350 mK
A. V. Merenkova, S. V. Shitovab, V. I. Chichkova, A. B. Ermakovb, T. M. Kima, A. V. Ustinovac a National University of Science and Technology «MISIS», Moscow
b Kotel'nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow
c Karlsruhe Institute of Technology, Karlsruhe, Germany
Abstract:
A high-quality superconducting resonator with a microbridge of hafnium film for use in a circuit for readout a terahertz-band imaging array with frequency division multiplexing is demonstrated experimentally. The variability of the impedance of the bridge at a frequency of 1.5 GHz, which is a key factor in the control of the quality of the resonator, is studied. The bridge, having a thickness of about 50 nm, a critical temperature
$T_C$ $\approx$ 380 mK, and a plan size of 2.5 $\times$ 2.5 $\mu$m, was connected as a load of a resonator made of niobium film with a thickness of about 100 nm ($T_C$ $\sim$ 9 K). It is shown that the bridge smoothly changes its impedance proportionally to the bias power in the entire temperature range. The effective thermal insulation of the bridge was measured in a dilution cryostat at temperatures of 50–300 mK. Thermal conductivity $G$ of the bridge was calculated and found to be $\sim$4 $\times$ 10$^{-13}$ W/K, which gives an estimate of the sensitivity of the structure in the bolometric mode NEP $\approx$ 8 $\times$ 10$^{-19}$ W/Hz$^{1/2}$ at a temperature of 150 mK.
Received: 11.12.2017
Citation:
A. V. Merenkov, S. V. Shitov, V. I. Chichkov, A. B. Ermakov, T. M. Kim, A. V. Ustinov, “A superconducting resonator with a hafnium microbridge at temperatures of 50–350 mK”, Pisma v Zhurnal Tekhnicheskoi Fiziki, 44:13 (2018), 59–67; Tech. Phys. Lett., 44:7 (2018), 581–584
Linking options:
https://www.mathnet.ru/eng/pjtf5764 https://www.mathnet.ru/eng/pjtf/v44/i13/p59
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