Temperature Effect on Negative $N$-Type Differential Conductivity in Current–Voltage Characteristics of Metallic Heterostructures with Superconducting Electrodes

A. P. Shapovalov$^{1,2}$, O. S. Zhytlukhina$^{3,4}$

$^{1}$G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{2}$I. M. Frantsevich Institute for Problems in Materials Science, NAS of Ukraine, 3 Academician Krzhyzhanovsky Str., UA-03142 Kyiv, Ukraine
$^{3}$Donetsk Institute for Physics and Engineering Named after O. O. Galkin, NAS of Ukraine, 46 Nauky Ave., UA-03028 Kyiv, Ukraine
$^{4}$Vasyl’ Stus Donetsk National University, 21 600-richchya Str., UA-21021 Vinnytsia, Ukraine

Received: 24.03.2020. Download: PDF

Two-level tunnelling systems determine low-energy properties of amorphous solids, in particular, the decoherence effect in quantum nanoscale devices based on superconducting metals. The main characteristics of two-level systems, as a rule, are well described by the standard tunnelling model. In the paper, we use the model to describe temperature effect on current–voltage characteristics of hybrid structures made of superconducting films with disordered silicon interlayers doped with nanoscale tungsten granules. Results of the calculations are in good agreement with our experimental data for MoRe/Si(W)/MoRe junctions.

Key words: three-layered nanostructures, superconducting electrodes, doped silicon interlayers, two-level tunnelling systems, negative differential conductance.

URL: http://mfint.imp.kiev.ua/en/abstract/v42/i09/1187.html

DOI: https://doi.org/10.15407/mfint.42.09.1187

PACS: 72.10.Fk, 73.63.-b, 74.78.Db, 85.30.Mn

Citation: A. P. Shapovalov and O. S. Zhytlukhina, Temperature Effect on Negative $N$-Type Differential Conductivity in Current–Voltage Characteristics of Metallic Heterostructures with Superconducting Electrodes, Metallofiz. Noveishie Tekhnol., 42, No. 9: 1187—1196 (2020) (in Ukrainian)

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