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A Superconducting Resonator with a Hafnium Microbridge at Temperatures of 50–350 mK
- Source :
- Technical Physics Letters. 44:581-584
- Publication Year :
- 2018
- Publisher :
- Pleiades Publishing Ltd, 2018.
-
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 TC ≈ 380 mK, and a plan size of 2.5 × 2.5 μm, was connected as a load of a resonator made of niobium film with a thickness of about 100 nm (TC ~ 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 ~4 × 10–13 W/K, which gives an estimate of the sensitivity of the structure in the bolometric mode NEP ≈ 8 × 10–19 W/Hz1/2 at a temperature of 150 mK.
- Subjects :
- Cryostat
Materials science
Physics and Astronomy (miscellaneous)
business.industry
Bolometer
Niobium
chemistry.chemical_element
Atmospheric temperature range
01 natural sciences
law.invention
Hafnium
010309 optics
Resonator
Thermal conductivity
chemistry
law
0103 physical sciences
Optoelectronics
010306 general physics
business
Electrical impedance
Subjects
Details
- ISSN :
- 10906533 and 10637850
- Volume :
- 44
- Database :
- OpenAIRE
- Journal :
- Technical Physics Letters
- Accession number :
- edsair.doi...........f3b8821f169c431b4b45abef16588cc4