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Sotnichuk SV, Skryabina OV, Shishkin AG, Golovchanskiy IA, Bakurskiy SV, Stolyarov VS, Napolskii KS. Controlled electrodeposition of cobalt nanowires using iRcompensation and their electron transport properties. NANOTECHNOLOGY 2024; 35:465001. [PMID: 39121868 DOI: 10.1088/1361-6528/ad6d72] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2024] [Accepted: 08/09/2024] [Indexed: 08/12/2024]
Abstract
Superconducting hybrid structures based on single nanowires are a new type of nanoscale devices with peculiar transport characteristics. Control over the nanowire structure is essential for understanding hybrid electronic phenomena arising in such complex systems. In this work, we report a technique for the fabrication of cobalt nanowires by template-assisted electrodeposition usingiRcompensation, which allows revealing the fundamental dependence of the preferred direction of nanowire growth on the deposition potential. Long coarse-grained cobalt nanowires with a diameter of 70 nm have been implemented into Nb/Co/Nb hybrid structures. We demonstrate that using electrode fabrication techniques that do not contaminate the surface of the nanowire leads to a high quality of devices with low-resistance interfaces. Low-temperature resistivity of 4.94 ± 0.83µΩ cm and other transport characteristics of Co nanowires are reported. The absence of long-range superconducting proximity effect for Nb/Co/Nb systems with different nanowire length is discussed.
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Affiliation(s)
- Stepan V Sotnichuk
- National University of Science and Technology MISIS, Moscow 119049, Russia
| | - Olga V Skryabina
- National University of Science and Technology MISIS, Moscow 119049, Russia
| | - Andrey G Shishkin
- National University of Science and Technology MISIS, Moscow 119049, Russia
| | | | - Sergey V Bakurskiy
- National University of Science and Technology MISIS, Moscow 119049, Russia
| | - Vasily S Stolyarov
- National University of Science and Technology MISIS, Moscow 119049, Russia
| | - Kirill S Napolskii
- National University of Science and Technology MISIS, Moscow 119049, Russia
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Ruzhickiy V, Bakurskiy S, Kupriyanov M, Klenov N, Soloviev I, Stolyarov V, Golubov A. Contribution of Processes in SN Electrodes to the Transport Properties of SN-N-NS Josephson Junctions. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1873. [PMID: 37368303 DOI: 10.3390/nano13121873] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 06/08/2023] [Accepted: 06/13/2023] [Indexed: 06/28/2023]
Abstract
In this paper, we present a theoretical study of electronic transport in planar Josephson Superconductor-Normal Metal-Superconductor (SN-N-NS) bridges with arbitrary transparency of the SN interfaces. We formulate and solve the two-dimensional problem of finding the spatial distribution of the supercurrent in the SN electrodes. This allows us to determine the scale of the weak coupling region in the SN-N-NS bridges, i.e., to describe this structure as a serial connection between the Josephson contact and the linear inductance of the current-carrying electrodes. We show that the presence of a two-dimensional spatial current distribution in the SN electrodes leads to a modification of the current-phase relation and the critical current magnitude of the bridges. In particular, the critical current decreases as the overlap area of the SN parts of the electrodes decreases. We show that this is accompanied by a transformation of the SN-N-NS structure from an SNS-type weak link to a double-barrier SINIS contact. In addition, we find the range of interface transparency in order to optimise device performance. The features we have discovered should have a significant impact on the operation of small-scale superconducting electronic devices, and should be taken into account in their design.
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Affiliation(s)
- Vsevolod Ruzhickiy
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
- Dukhov All-Russia Research Institute of Automatics, 101000 Moscow, Russia
- National University of Science and Technology MISIS, 119049 Moscow, Russia
| | - Sergey Bakurskiy
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
- National University of Science and Technology MISIS, 119049 Moscow, Russia
| | - Mikhail Kupriyanov
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
- National University of Science and Technology MISIS, 119049 Moscow, Russia
| | - Nikolay Klenov
- National University of Science and Technology MISIS, 119049 Moscow, Russia
- Faculty of Physics, Moscow State University, 119991 Moscow, Russia
| | - Igor Soloviev
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
- National University of Science and Technology MISIS, 119049 Moscow, Russia
| | - Vasily Stolyarov
- Dukhov All-Russia Research Institute of Automatics, 101000 Moscow, Russia
- National University of Science and Technology MISIS, 119049 Moscow, Russia
- Center for Advanced Mesoscience and Nanotechnology, Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
| | - Alexander Golubov
- Center for Advanced Mesoscience and Nanotechnology, Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
- Faculty of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands
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Noyan AA, Ovchenkov YA, Ryazanov VV, Golovchanskiy IA, Stolyarov VS, Levin EE, Napolskii KS. Size-Dependent Superconducting Properties of In Nanowire Arrays. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:4095. [PMID: 36432380 PMCID: PMC9695479 DOI: 10.3390/nano12224095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 11/08/2022] [Accepted: 11/14/2022] [Indexed: 06/16/2023]
Abstract
Arrays of superconducting nanowires may be useful as elements of novel nanoelectronic devices. The superconducting properties of nanowires differ significantly from the properties of bulk structures. For instance, different vortex configurations of the magnetic field have previously been predicted for nanowires with different diameters. In the present study, arrays of parallel superconducting In nanowires with the diameters of 45 nm, 200 nm, and 550 nm-the same order of magnitude as coherence length ξ-were fabricated by templated electrodeposition. Values of magnetic moment M of the samples were measured as a function of magnetic field H and temperature T in axial and transverse fields. M(H) curves for the arrays of nanowires with 45 nm and 200 nm diameters are reversible, whereas magnetization curves for the array of nanowires with 550 nm diameter have several feature points and show a significant difference between increasing and decreasing field branches. Critical fields increase with a decrease in diameter, and the thinnest nanowires exceed bulk critical fields by 20 times. The qualitative change indicates that magnetic field configurations are different in the nanowires with different diameters. Variation of M(H) slope in small fields, heat capacity, and the magnetic field penetration depth with the temperature were measured. Superconductivity in In nanowires is proven to exist above the bulk critical temperature.
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Affiliation(s)
- Alexey A. Noyan
- Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
- Lomonosov Moscow State University, 119991 Moscow, Russia
| | | | - Valery V. Ryazanov
- Institute of Solid State Physics RAS, 142432 Chernogolovka, Russia
- National University of Science and Technology MISIS, 119049 Moscow, Russia
| | - Igor A. Golovchanskiy
- Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
- National University of Science and Technology MISIS, 119049 Moscow, Russia
| | - Vasily S. Stolyarov
- Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
- National University of Science and Technology MISIS, 119049 Moscow, Russia
| | | | - Kirill S. Napolskii
- Lomonosov Moscow State University, 119991 Moscow, Russia
- National University of Science and Technology MISIS, 119049 Moscow, Russia
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Environment-induced overheating phenomena in Au-nanowire based Josephson junctions. Sci Rep 2021; 11:15274. [PMID: 34315993 PMCID: PMC8316400 DOI: 10.1038/s41598-021-94720-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 07/14/2021] [Indexed: 11/08/2022] Open
Abstract
Unlike conventional planar Josephson junctions, nanowire-based devices have a bridge geometry with a peculiar coupling to environment that can favor non-equilibrium electronic phenomena. Here we measure the influence of the electron bath overheating on critical current of several bridge-like junctions built on a single Au-nanowire. Using the Usadel theory and applying the two-fluid description for the normal and superconducting components of the flowing currents, we reveal and explain the mutual influence of the neighbouring junctions on their characteristics through various processes of the electron gas overheating. Our results provide additional ways to control nanowire-based superconducting devices.
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Kim J, Kim BK, Kim HS, Hwang A, Kim B, Doh YJ. Macroscopic Quantum Tunneling in Superconducting Junctions of β-Ag 2Se Topological Insulator Nanowire. NANO LETTERS 2017; 17:6997-7002. [PMID: 29064253 DOI: 10.1021/acs.nanolett.7b03571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report on the fabrication and electrical transport properties of superconducting junctions made of β-Ag2Se topological insulator (TI) nanowires in contact with Al superconducting electrodes. The temperature dependence of the critical current indicates that the superconducting junction belongs to a short and diffusive junction regime. As a characteristic feature of the narrow junction, the critical current decreases monotonously with increasing magnetic field. The stochastic distribution of the switching current exhibits the macroscopic quantum tunneling behavior, which is robust up to T = 0.8 K. Our observations indicate that the TI nanowire-based Josephson junctions can be a promising building block for the development of nanohybrid superconducting quantum bits.
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Affiliation(s)
- Jihwan Kim
- Department of Chemistry, KAIST , Daejeon 34141, Korea
| | - Bum-Kyu Kim
- Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST) , Gwangju 61005, Korea
| | - Hong-Seok Kim
- Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST) , Gwangju 61005, Korea
| | - Ahreum Hwang
- Department of Chemistry, KAIST , Daejeon 34141, Korea
| | - Bongsoo Kim
- Department of Chemistry, KAIST , Daejeon 34141, Korea
| | - Yong-Joo Doh
- Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST) , Gwangju 61005, Korea
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Kim BK, Kim HS, Yang Y, Peng X, Yu D, Doh YJ. Strong Superconducting Proximity Effects in PbS Semiconductor Nanowires. ACS NANO 2017; 11:221-226. [PMID: 28051853 DOI: 10.1021/acsnano.6b04774] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report the fabrication of strongly coupled nanohybrid superconducting junctions using PbS semiconductor nanowires and Pb0.5In0.5 superconducting electrodes. The maximum supercurrent in the junction reaches up to ∼15 μA at 0.3 K, which is the highest value ever observed in semiconductor-nanowire-based superconducting junctions. The observation of microwave-induced constant voltage steps confirms the existence of genuine Josephson coupling through the nanowire. Monotonic suppression of the critical current under an external magnetic field is also in good agreement with the narrow junction model. The temperature-dependent stochastic distribution of the switching current exhibits a crossover from phase diffusion to a thermal activation process as the temperature decreases. These strongly coupled nanohybrid superconducting junctions would be advantageous to the development of gate-tunable superconducting quantum information devices.
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Affiliation(s)
- Bum-Kyu Kim
- Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST) , Gwangju 61005, Korea
| | - Hong-Seok Kim
- Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST) , Gwangju 61005, Korea
| | - Yiming Yang
- Department of Physics, University of California , Davis, California 95616, United States
| | - Xingyue Peng
- Department of Physics, University of California , Davis, California 95616, United States
| | - Dong Yu
- Department of Physics, University of California , Davis, California 95616, United States
| | - Yong-Joo Doh
- Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST) , Gwangju 61005, Korea
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Ultimately short ballistic vertical graphene Josephson junctions. Nat Commun 2015; 6:6181. [PMID: 25635386 PMCID: PMC4317505 DOI: 10.1038/ncomms7181] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Accepted: 12/27/2014] [Indexed: 11/26/2022] Open
Abstract
Much efforts have been made for the realization of hybrid Josephson junctions incorporating various materials for the fundamental studies of exotic physical phenomena as well as the applications to superconducting quantum devices. Nonetheless, the efforts have been hindered by the diffusive nature of the conducting channels and interfaces. To overcome the obstacles, we vertically sandwiched a cleaved graphene monoatomic layer as the normal-conducting spacer between superconducting electrodes. The atomically thin single-crystalline graphene layer serves as an ultimately short conducting channel, with highly transparent interfaces with superconductors. In particular, we show the strong Josephson coupling reaching the theoretical limit, the convex-shaped temperature dependence of the Josephson critical current and the exceptionally skewed phase dependence of the Josephson current; all demonstrate the bona fide short and ballistic Josephson nature. This vertical stacking scheme for extremely thin transparent spacers would open a new pathway for exploring the exotic coherence phenomena occurring on an atomic scale. The functionality of Josephson junctions—a thin insulating layer between two superconducting regions—is greatly enhanced by using hybrid material systems. Here, the authors incorporate graphene into a Josephson junction and demonstrate ballistic transport through the atom-thick layer.
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Gu F, Zeng H, Tong L, Zhuang S. Metal single-nanowire plasmonic sensors. OPTICS LETTERS 2013; 38:1826-1828. [PMID: 23722757 DOI: 10.1364/ol.38.001826] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We demonstrated a general approach for plasmonic sensing using metal single nanowires based on an evanescent coupling technique, where light was efficiently launched into and picked up from the metal nanowires using silica fiber tapers. A high amplitude sensitivity of ~13 dB to 1.2% hydrogen was obtained using palladium-coated Au nanowires for hydrogen sensing, and a fast response of ~5 ms was obtained using a polyacrylamide film-supported Ag nanowire for relative humidity sensing. Our results may help develop metal nanowire-based plasmonic sensors.
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Affiliation(s)
- Fuxing Gu
- Institute Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System, Ministry of Education, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
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Kim BK, Ahn YH, Kim JJ, Choi MS, Bae MH, Kang K, Lim JS, López R, Kim N. Transport measurement of Andreev bound states in a Kondo-correlated quantum dot. PHYSICAL REVIEW LETTERS 2013; 110:076803. [PMID: 25166391 DOI: 10.1103/physrevlett.110.076803] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Indexed: 06/03/2023]
Abstract
We report nonequilibrium transport measurements of gate-tunable Andreev bound states in a carbon nanotube quantum dot coupled to two superconducting leads. In particular, we observe clear features of two types of Kondo ridges, which can be understood in terms of the interplay between the Kondo effect and superconductivity. In the first type (type I), the coupling is strong and the Kondo effect is dominant. Levels of the Andreev bound states display anticrossing in the middle of the ridge. On the other hand, crossing of the two Andreev bound states is shown in the second type (type II) together with the 0-π transition of the Josephson junction. Our scenario is well understood in terms of only a single dimensionless parameter, k(B)T(K)(min)/Δ, where T(K)(min) and Δ are the minimum Kondo temperature of a ridge and the superconducting order parameter, respectively. Our observation is consistent with measurements of the critical current, and is supported by numerical renormalization group calculations.
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Affiliation(s)
- Bum-Kyu Kim
- Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea and Department of Physics, Chonbuk National University, Jeonju 561-756, Republic of Korea
| | - Ye-Hwan Ahn
- Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea and Department of Physics, Korea University, Seoul 136-713, Republic of Korea
| | - Ju-Jin Kim
- Department of Physics, Chonbuk National University, Jeonju 561-756, Republic of Korea
| | - Mahn-Soo Choi
- Department of Physics, Korea University, Seoul 136-713, Republic of Korea
| | - Myung-Ho Bae
- Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea
| | - Kicheon Kang
- Department of Physics, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Jong Soo Lim
- Institut de Física Interdisciplinar i de Sistemes Complexos IFISC (CSIC-UIB), E-07122 Palma de Mallorca, Spain
| | - Rosa López
- Institut de Física Interdisciplinar i de Sistemes Complexos IFISC (CSIC-UIB), E-07122 Palma de Mallorca, Spain and Departament de Física, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain
| | - Nam Kim
- Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea
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