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Open AccessArticle

Current-Resistance Effects Inducing Nonlinear Fluctuation Mechanisms in Granular Aluminum Oxide Nanowires

1
Dipartimento di Fisica “E.R. Caianiello”, Università degli Studi di Salerno, I-84084 Fisciano, Salerno, Italy
2
CNR-SPIN Salerno, c/o Università degli Studi di Salerno, I-84084 Fisciano, Salerno, Italy
3
INFN Gruppo Collegato di Salerno, c/o Università degli Studi di Salerno, I-84084 Fisciano, Salerno, Italy
4
Physikalisches Institut, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany
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Institut für Quantenmaterialien und Technologien (IQMT), Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany
6
National University of Science and Technology MISIS, 119049 Moscow, Russia
7
Russian Quantum Center, Skolkovo, 143025 Moscow, Russia
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(3), 524; https://doi.org/10.3390/nano10030524
Received: 17 February 2020 / Revised: 6 March 2020 / Accepted: 11 March 2020 / Published: 14 March 2020
(This article belongs to the Special Issue Superconducting- and Graphene-based Devices)
The unusual superconducting properties of granular aluminum oxide have been recently investigated for application in quantum circuits. However, the intrinsic irregular structure of this material requires a good understanding of the transport mechanisms and, in particular, the effect of disorder, especially when patterned at the nanoscale level. In view of these aspects, electric transport and voltage fluctuations have been investigated on thin-film based granular aluminum oxide nanowires, in the normal state and at temperatures between 8 and 300 K. The nonlinear resistivity and two-level tunneling fluctuators have been observed. Regarding the nature of the noise processes, the experimental findings give a clear indication in favor of a dynamic random resistor network model, rather than the possible existence of a local ordering of magnetic origin. The identification of the charge carrier fluctuations in the normal state of granular aluminum oxide nanowires is very useful for improving the fabrication process and, therefore, reducing the possible sources of decoherence in the superconducting state, where quantum technologies that are based on these nanostructures should work. View Full-Text
Keywords: quantum electronics; noise spectroscopy; granular aluminum oxide; superconducting nanowires; current-resistance effects quantum electronics; noise spectroscopy; granular aluminum oxide; superconducting nanowires; current-resistance effects
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MDPI and ACS Style

Barone, C.; Rotzinger, H.; Voss, J.N.; Mauro, C.; Schön, Y.; Ustinov, A.V.; Pagano, S. Current-Resistance Effects Inducing Nonlinear Fluctuation Mechanisms in Granular Aluminum Oxide Nanowires. Nanomaterials 2020, 10, 524.

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