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Author |
Dieleman, Piter |
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Title |
Fundamental limitations of THz niobium and niobiumnitride SIS mixers |
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Year |
1998 |
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Keywords |
SIS |
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Ph.D. thesis |
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Rijksuniversiteit, Groningen |
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no |
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529 |
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Author |
Kooi, Jacob Willem |
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Title |
Advanced receivers for submillimeter and far infrared astronomy |
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Book Whole |
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Year |
2008 |
Publication |
University of Groningen |
Abbreviated Journal |
RUG |
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Keywords |
HEB, SIS, TES, NEP, noise temperature, IF bandwidth, waveguide, impedance, conversion gain, FTS, integrated array, stability, Allan variance, multi-layer antireflection coating |
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Doctoral thesis |
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978-90-367-3653-4 |
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no |
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881 |
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Author |
Ovchinnikov, Yu. N.; Varlamov, A. A. |
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Title |
Fluctuation-dissipative phenomena in a narrow superconducting channel carrying current below critical |
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Journal Article |
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Year |
2009 |
Publication |
arXiv |
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Volume |
0910.2659v1 |
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1-4 |
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Keywords |
superconducting nanowire, resistance calculation |
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Abstract |
The theory of current transport in a narrow superconducting channel accounting for thermal fluctuations is developed. These fluctuations result in the appearance of small but finite dissipation in the sample. The value of corresponding voltage is found as the function of temperature (close to transition temperature) and arbitrary bias current. It is demonstrated that the value of the activation energy (exponential factor in the Arrenius law) when current approaches to the critical one is proportional to (1-J/Jc)^(5/4). This result is in concordance with the one for the affine phenomenon of the Josephson current decay due to the thermal phase fluctuations, where the activation energy proportional (1-J/J_c)^(3/2)(the difference in the exponents is related to the additional current dependence of the order parameter). Found dependence of the activation energy on current explains the enormous discrepancy between the theoretically predicted before and the experimentally observed broadening of the resistive transition. |
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arXiv:0910.2659v1; 4 pages, 3 figures |
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931 |
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Author |
Samsonova, Alena; Zolotov, Philipp; Baeva, Elmira; Lomakin, Andrey; Titova, Nadezhda; Kardakova, Anna; Goltsman, Gregory |
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Title |
Signatures of surface magnetic disorder in thin niobium films |
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Journal Article |
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Year |
2021 |
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IEEE Trans. Appl. Supercond. |
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1-1 |
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Keywords |
Temperature measurement, Temperature dependence, Superconducting magnets, Superconducting transition temperature, Substrates, Resistance, Scattering |
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Abstract |
We present our studies on the evolution of the normal and superconducting properties with thickness of thin Nb films with a low level of non-magnetic disorder (kFl 150 for the thickest film in the set). The analysis of the superconducting behavior points to the presence of magnetic moments, hidden in the native oxide on the surface of Nb films. Using the Abrikosov-Gorkov theory, we obtain the density of surface magnetic moments of 1013 cm-2, which is in agreement with the previously reported data for Nb films. |
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1051-8223 |
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1162 |
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Author |
Jackson, B. D.; Hesper, R.; Adema, J.; Barkhof, J.; Baryshev, A. M.; Zijlstra, T.; Zhu, S.; Klapwijk, T. M. |
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Title |
Series production of state-of-the-art 602-720 GHz SIS receivers for band 9 of ALMA |
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Conference Article |
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Year |
2009 |
Publication |
Proc. 20th Int. Symp. Space Terahertz Technol. |
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Pages |
7-11 |
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Keywords |
SIS mixer, noise temperature, ALMA, band 9 |
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Abstract |
The Atacama Large Millimeter/Sub-millimeter Array (ALMA) requires the development and production of 73 state-of-the-art receivers for the 602-720 GHz range – the ALMA Band 9 cartridges. Development and pre-production of the first 8 cartridges was completed between 2003 and 2008, resulting in a cartridge design that meets the project's challenging requirements. The cartridge design remains essentially unchanged for production, while the production and test processes developed during pre-production have been fine-tuned to address the biggest new challenge for this phase – ramping up production to a rate of 2 cartridges per month over 2009-2012. |
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618 |
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