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On the passive electrode signal in X-ray detectors based on superconducting tunnel junctions

  • Superconductivity
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Abstract

X-ray detectors based on superconducting tunnel junctions with the multilayer electrode structure described by the formula Ti/Nb/Al, AlO x /Al/Nb/NbN were studied. The main signal arose during X-ray absorption in the top electrode and had an energy resolution of ∼90 eV at the 5.9-keV line. The bottom passive Ti/Nb electrode provided rapid absorption of excess quasiparticles. The residual signal of the passive electrode was from 7 to 17% of the main signal amplitude. The dependences of the amplitude of this signal on the voltage and the absorbed X-ray energy were measured for detectors with different thicknesses of the top and bottom electrodes. The rate of quasiparticle trapping by the energy trap in the Ti/Nb bilayer was estimated. The main mechanisms of the formation of the passive electrode signal formation were considered and methods for its suppression were proposed.

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Authors and Affiliations

  1. Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119991, Russia

    V. A. Andrianov

  2. Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, ul. Mokhovaya 11-7, Moscow, 125009, Russia

    V. P. Koshelets & L. V. Filippenko

Authors
  1. V. A. Andrianov
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  2. V. P. Koshelets
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  3. L. V. Filippenko
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Correspondence to V. A. Andrianov.

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Original Russian Text © V.A. Andrianov, V.P. Koshelets, L.V. Filippenko, 2011, published in Fizika Tverdogo Tela, 2011, Vol. 53, No. 8, pp. 1466–1472.

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Andrianov, V.A., Koshelets, V.P. & Filippenko, L.V. On the passive electrode signal in X-ray detectors based on superconducting tunnel junctions. Phys. Solid State 53, 1540–1546 (2011). https://doi.org/10.1134/S106378341108004X

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