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Zhurnal Tekhnicheskoi Fiziki, 2024 Volume 94, Issue 7, Pages 1044–1052 (Mi jtf6805)

XXVIII International Symposium ''Nanophysics and Nanoelectronics'', Nizhny Novgorod, March 11-15, 2024
Solids

Spectral measurements of a niobium Josephson junction array by a superconducting receiver with a mixer based on high-temperature bicrystalline junction

M. A. Galina, L. S. Revinab, A. V. Samartsevab, M. Yu. Levicheva, A. I. El'kinaa, D. V. Masterova

a Institute for Physics of Microstructures, Russian Academy of Sciences, 603087 Nizhny Novgorod, Russia
b Nizhny Novgorod State Technical University, 603087 Nizhny Novgorod, Russia

Abstract: Spectral measurements of a niobium Josephson junctions array were performed to estimate the Josephson radiation linewidth. The array consists of 9996 Nb/NbSi/Nb junctions connected in series, occupying an area of 5 $\times$ 7 mm$^2$ on a silicon substrate. To analyze the Josephson spectrum, a heterodyne superconducting receiver with a mixer based on a high-temperature superconducting Josephson junction was used. Significant decrease of the linewidth to 0.3–0.8 MHz was detected, when the array is connected to an autonomous power source.

Keywords: Josephson junctions, HTSC, heterodyne receiver, spectrum, synchronization, terahertz emission.

Received: 13.05.2024
Revised: 13.05.2024
Accepted: 13.05.2024

DOI: 10.61011/JTF.2024.07.58339.166-24



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