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Articles de revues sur le sujet « SUPERCONDUCTING NANOSTRUCTURE »

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Auteur : Grafiati

Publié le 11 septembre 2023

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1

LYUKSYUTOV, I. F. « CONTROLLING SUPERCONDUCTIVITY WITH MAGNETIC NANOSTRUCTURES ». International Journal of Modern Physics B 27, n^o 15 (4 juin 2013) : 1362004. http://dx.doi.org/10.1142/s021797921362004x.

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We discuss different possibilities to control vortex motion in a thin superconducting film with Tesla range magnetic fields generated by magnetic nanostructures. These nanostructures can be embedded into the superconducting film (arrays of magnetic nanorods) or placed outside the film and separated from it with an insulating layer (arrays of magnetic nanostripes). Interaction of the superconducting film with the magnetic nanostructure results in a strong increase and hysteresis of the critical current, in a strong anisotropy of the critical current (in the case of magnetic nanostripes) and several other phenomena. It is feasible to fabricate systems where the magnetic field from the nanostructures changes sign on the scale of the coherence length. We discuss possible new phenomena in such systems and its implementations.

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Shlyakhova, G. V., S. A. Barannikova et L. B. Zuev. « Nanostructure of superconducting Nb-Ti cable ». Steel in Translation 43, n^o 10 (octobre 2013) : 640–43. http://dx.doi.org/10.3103/s0967091213100124.

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Lazarev, B. G., V. A. Ksenofontov, I. M. Mikhailovskii et O. A. Velikodnaya. « Nanostructure of superconducting Nb–Ti alloys ». Low Temperature Physics 24, n^o 3 (mars 1998) : 205–9. http://dx.doi.org/10.1063/1.593572.

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Horide, Tomoya, Hiromu Katagiri, Ataru Ichinose et Kaname Matsumoto. « Fabrication of Fe(Te,Se) films added with oxide or chalcogenide : Influence of added material on phase formation and superconducting properties ». Journal of Applied Physics 131, n^o 10 (14 mars 2022) : 103901. http://dx.doi.org/10.1063/5.0085234.

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Incorporation of a dopant, an impurity, and a non-superconducting second phase in superconducting films is an important approach to control the superconducting property. In spite of extensive studies on the oxide superconducting nanocomposite films, the influence of additive materials on the phase formation and nanostructure is unclear in the iron based superconducting chalcogenide, Fe(Te,Se). Here, the incorporation of oxide or chalcogenide in Fe(Te,Se) films using pulsed laser deposition was investigated. When TiO2, Fe2O3, Yb2O3, CeO2, Nb2O5, SnSe, or SnTe was added, c axis oriented Fe(Te,Se) films were not formed. On the other hand, c axis oriented Fe(Te,Se) films were obtained when SrTiO3 was added at the content of 3–10 areal% and the deposition temperature of 400–550 °C. While a characteristic nanostructure originating from SrTiO3 was not observed for the small SrTiO3 content (3%), the nanocomposite structure comprising of nanocolumns was formed for the large SrTiO3 content (10%). The critical temperature was 8.2–8.6 K in the Fe(Te,Se) + SrTiO3(3%) thin films deposited at 500 °C, while the critical temperature was ∼10 K in the Fe(Te,Se) films. The irreversibility curve behavior was varied by the structural change in the natural pinning centers, which resulted from the SrTiO3 addition, while the pinning effect by the nanocomposite structure was concealed by the Tc degradation in the case of the large amount of SrTiO3 addition. Considering the dependence of the film structure on the additive material and the incorporation content, the superconducting properties of Fe(Te,Se) films should be designed.

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Tarasov, Mikhail, Andrey Lomov, Artem Chekushkin, Mikhail Fominsky, Denis Zakharov, Andrey Tatarintsev, Sergey Kraevsky et Anton Shadrin. « Quasiepitaxial Aluminum Film Nanostructure Optimization for Superconducting Quantum Electronic Devices ». Nanomaterials 13, n^o 13 (4 juillet 2023) : 2002. http://dx.doi.org/10.3390/nano13132002.

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In this paper, we develop fabrication technology and study aluminum films intended for superconducting quantum nanoelectronics using AFM, SEM, XRD, HRXRR. Two-temperature-step quasiepitaxial growth of Al on (111) Si substrate provides a preferentially (111)-oriented Al polycrystalline film and reduces outgrowth bumps, peak-to-peak roughness from 70 to 10 nm, and texture coefficient from 3.5 to 1.7, while increasing hardness from 5.4 to 16 GPa. Future progress in superconducting current density, stray capacitance, relaxation time, and noise requires a reduction in structural defect density and surface imperfections, which can be achieved by improving film quality using such quasiepitaxial growth techniques.

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Savostin, E. O., et N. A. Pertsev. « Superconducting straintronics via the proximity effect in superconductor–ferromagnet nanostructures ». Nanoscale 12, n^o 2 (2020) : 648–57. http://dx.doi.org/10.1039/c9nr06739f.

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Zhilyaev, Ivan. « Nanostructure Model for Superconducting State of High-Temperature Superconductors-Cuprates ». Quantum Matter 4, n^o 4 (1 août 2015) : 334–38. http://dx.doi.org/10.1166/qm.2015.1202.

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Alkaabi, Zaid K., et Emad K. Al-Shakarchi. « Studying the Physical Properties of Bi-2223 Nanostructure Prepared Thermal Treatment Method ». Materials Science Forum 1039 (20 juillet 2021) : 269–73. http://dx.doi.org/10.4028/www.scientific.net/msf.1039.269.

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Recently, the researchers gave a great interest in the superconducting topic, as the preparation method is importance to reach a high critical temperature. In this study, the Bi2Sr2Ca2Cu3O10 (Bi-2223) compound prepared by thermal treatment method at different sintering temperatures such as (600, 700, 850) °C at (7) PH for (20 hrs). The phase formation was observed by X-ray diffraction, as well as information about the crystal structure, as the peaks were almost identical to the international standard document. the peaks are well indexed by tetragonal phase of Bi-2223. The results of the electrical resistance test showed that there is a difference in the critical temperature depending on the difference of the sintering temperatures The best result was at a temperature of 850 ° C. The sizes of the nanoparticles ranged from (22 - 123) nm, this is what the TEM measurements showed. It has been shown to be a successful method for preparing superconducting nanoparticles as (Bi-2223) compound

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Prikhna, T. A., A. P. Shapovalov, G. E. Grechnev, V. G. Boutko, A. A. Gusev, A. V. Kozyrev, M. A. Belogolovskiy, V. E. Moshchil et V. B. Sverdun. « Formation of nanostructure in magnesium diboride based materials with high superconducting characteristics ». Low Temperature Physics 42, n^o 5 (mai 2016) : 380–94. http://dx.doi.org/10.1063/1.4952985.

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Tsai, J. S., Y. Nakamura et YU Pashkin. « Qubit utilizing charge-number state in super conducting nanostructure ». Quantum Information and Computation 1, Special (décembre 2001) : 124–28. http://dx.doi.org/10.26421/qic1.s-13.

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In single-Cooper-pair box, the number of electrons in the box is quantized and they form a single macroscopic quantum charge-number state, corresponding to the number of excess electrons in the box. By making all the electrodes superconducting, we can couple two neighboring charge-number states coherently. In this way one can create an artificial two-level system. Qubit operations were demonstrated in two different control techniques, dc electric-field gate bias and ac field bias. The dc method was unique compared with the commonly used Rabi-oscillation-type operation. Here the system was biased at the degenerate point of the two states so that the dynamical phase does not develop during the operation. This was the first time that the quantum coherent oscillation was observed in a solid-state device whose quantum states involved a macroscopic number of quantum particles. Multiple-pulse experiments were also carried out and phase control was also demonstrated.

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Pong, Ian, Christian Scheuerlein, Carmine Senatore, Ludovic Thilly, Marco Di Michiel, Alexandre Gerardin, Simon C. Hopkins et al. « Cu Ti Formation in Nb Ti/Cu Superconducting Strand Monitored by In Situ Techniques ». Defect and Diffusion Forum 297-301 (avril 2010) : 695–701. http://dx.doi.org/10.4028/www.scientific.net/ddf.297-301.695.

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In order to investigate the high temperature exposure effect on Nb Ti/Cu superconducting strands, as might be encountered in joining by soldering and in cabling annealing, X-ray diffraction and resistometry measurements were performed in situ during heat treatment, and complemented by conventional metallography, mechanical tests and superconducting properties measurements. Changes of the Nb Ti nanostructure at temperatures above 300°C are manifested in the degradation of critical current in an applied external magnetic field, although degradation at self field was insignificant up to 400°C for several minutes. Above 500°C, the formation of various Cu Ti intermetallic compounds, due to Ti diffusion from Nb Ti into Cu, is detected by in situ XRD albeit not resolvable by SEM-EDS. There is a ductile to brittle transition near 600°C, and liquid formation is observed below 900°C. The formation of Cu Ti causes a delayed reduction of the residual resistivity ratio (RRR) and adversely affects the deformation behaviour of the strands.

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Obradors, X., T. Puig, S. Ricart, M. Coll, J. Gazquez, A. Palau et X. Granados. « Growth, nanostructure and vortex pinning in superconducting YBa2Cu3O7thin films based on trifluoroacetate solutions ». Superconductor Science and Technology 25, n^o 12 (26 octobre 2012) : 123001. http://dx.doi.org/10.1088/0953-2048/25/12/123001.

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Ayani, C. G., F. Calleja, P. Casado Aguilar, A. Norris, J. J. Navarro, M. Garnica, M. Acebrón et al. « Robust, carbon related, superconducting nanostructure at the apex of a tungsten STM tip ». Applied Physics Letters 115, n^o 7 (12 août 2019) : 073108. http://dx.doi.org/10.1063/1.5097694.

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Prikhna, Tatiana, Michael Eisterer, Wolfgang Gawalek, Harald W. Weber, Viktor Moshchil, Artem Kozyrev, Myroslav Karpets et al. « Influence of Oxygen and Boron Distribution on the Superconducting Characteristics of Nanostructural Mg-B-O Ceramics ». Solid State Phenomena 200 (avril 2013) : 137–43. http://dx.doi.org/10.4028/www.scientific.net/ssp.200.137.

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The superconducting characteristics, such as the critical current density and the critical magnetic fields, of MgB2-based materials, which in fact belong to the Mg-B-O system because of the high concentration of admixed oxygen (up to 17 wt. %), depend on the inhomogeneity of the oxygen and boron distribution, which can be controlled by the synthesis temperature (600-1200 oC) and pressure (up to 2 GPa) as well as by SiC and Ti additions (10 wt%). With increasing manufacturing temperature grain boundary pinning transforms into point pinning, which is well correlated with the transformation of discontinuous oxygen enriched layers into separately located Mg-B-O inclusions in the MgB2 nanostructure and with a reduction of the size and amount of inclusions of higher magnesium borides MgBX (X>2). Ti or SiC additions can influence the oxygen and boron distribution as SEM and Auger structural studies showed.

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Михайлин, Н. Ю., Д. В. Шамшур, Р. В. Парфеньев, В. И. Козуб, Ю. М. Гальперин, Ю. А. Кумзеров et А. В. Фокин. « Размерные зависимости магнитных свойств сверхпроводящих наноструктур свинца в пористом стекле ». Физика твердого тела 60, n^o 6 (2018) : 1058. http://dx.doi.org/10.21883/ftt.2018.06.45976.11m.

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AbstractSuperconducting structures Pb–PG formed by filling a porous glass matrix with the lead from melt under pressure have been investigated. Samples with characteristic pore structure diameters of d ≈ 7, 3, and 2 nm have been studied. It has been found that the critical temperature of the superconducting transition in the samples under study is similar to the corresponding value T _ c ≈ 7.2 K for bulk lead. At the same time, it has been observed that the critical magnetic field of the nanocomposites, which attains H _ c ( T = 0 K) ≈ 165 kOe for Pb–PG (3 nm), exceeds several times the value H _ c (0) = 803 Oe for bulk lead. The low-temperature magnetic- field dependences of magnetic moment M ( H ) contain quasi-periodic flux jumps, which vanish with a decrease in the lead nanostructure diameter. A qualitative model of the observed effects is considered.

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Ye, Yan, Da Yin, Bin Wang et Qingwen Zhang. « Synthesis of Three-Dimensional Fe3O4/Graphene Aerogels for the Removal of Arsenic Ions from Water ». Journal of Nanomaterials 2015 (2015) : 1–6. http://dx.doi.org/10.1155/2015/864864.

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We report the synthesis of three-dimensional Fe3O4/graphene aerogels (GAs) and their application for the removal of arsenic (As) ions from water. The morphology and properties of Fe3O4/GAs have been characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and superconducting quantum inference device. The 3D nanostructure shows that iron oxide nanoparticles are decorated on graphene with an interconnected network structure. It is found that Fe3O4/GAs own a capacity of As(V) ions adsorption up to 40.048 mg/g due to their remarkable 3D structure and existence of magnetic Fe3O4nanoparticles for separation. The adsorption isotherm matches well with the Langmuir model and kinetic analysis suggests that the adsorption process is pseudo-second-ordered. In addition to the excellent adsorption capability, Fe3O4/GAs can be easily and effectively separated from water, indicating potential applications in water treatment.

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Zhou, W. L., J. Wiemann, K. L. Stokes et C. J. O’Connor. « Monodisperse Pbse Nanoparticle Self-Assembling Nanoarrays Before and After Annealing ». Microscopy and Microanalysis 7, S2 (août 2001) : 314–15. http://dx.doi.org/10.1017/s1431927600027641.

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A variety of semiconductor and metal nanoparticles can be synthesized and tunable in size from about 10 to 200 Å using size-selective separation technique. Preparation of monodisperse samples enables systematic characterization of the structural, electron, and optical properties of materials as they evolve from molecular to bulk in the nanometer size range. Sample uniformity makes it possible to manipulate nanocrystals into close-packed, glassy and ordered nanocrystal. At inter-particle separations 5-100 Å, dipole-dipole interactions lead to energy transfer between neighboring nanocrystals, and electronic tunneling between proximal nanocrystals gives rise to dark and photoconductivity. The fabrication of monodisperse ordered nanoarrays with the inter-particle separations less than 5Å will be very important to study its physical properties since interaction between neighboring nanocrystals cause otherwise insulating assemblies to become semiconducting, metallic, or superconducting depending on nanocrystals composition. Here we present the fabrication of monodisperse PbSe nanoarrays with inter-particle distance less than 5 Å and its nanostructure study.

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Shevchun, Artem F., Galina K. Strukova, Ivan M. Shmyt’ko, Gennady V. Strukov, Sergey A. Vitkalov, Dmitry S. Yakovlev, Ivan A. Nazhestkin et Dmitry V. Shovkun. « Superconductivity in Hierarchical 3D Nanostructured Pb–In Alloys ». Symmetry 14, n^o 10 (13 octobre 2022) : 2142. http://dx.doi.org/10.3390/sym14102142.

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The superconducting properties of hierarchical nanostructured samples of Pb–In alloys have been studied by the measurement of dynamic susceptibility χ(T) temperature dependence. Symmetric samples with different shapes and sizes were formed on a brass metallic net by cathode-metal electrodeposition with a programmed pulsing current. Two different kinds of χ(T) dependence were observed in synthesized structures. The first kind was a broad superconductive transition without energy dissipation with a very weak response to the external magnetic field. The second kind was, conversely, an abrupt transition signifying an energy dissipation with a significant field response. This behavior depends on the ratio between a superconducting domain size (defined by the London penetration depth λ) and a crystallite size. In these cases, one or several superconducting domains are present in a sample. This result paves the way to controlling a superconducting domain size in materials with the parameters of a pulsed current.

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Tu, Kaixiong, Jinxing Gu, Linguo Lu, Shijun Yuan, Long Zhou et Zhongfang Chen. « CuB monolayer : a novel 2D anti-van’t Hoff/Le Bel nanostructure with planar hyper-coordinate boron/copper and superconductivity ». Journal of Materials Informatics 2, n^o 3 (2022) : 13. http://dx.doi.org/10.20517/jmi.2022.10.

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To achieve specific applications, it is always desirable to design new materials with peculiar topological properties. Herein, based on a D2h B2Cu6H6 molecule with the unique chemical bonding of planar pentacoordinate boron (ppB) as a building block, we constructed an infinite CuB monolayer by linking B2Cu6 subunits in an orthorhombic lattice. The planarity of the CuB sheet is attributed to the multicenter bonds and electron donation-back donation, as revealed by chemical bonding analysis. As a global minimum confirmed by the particle swarm optimization method, the CuB monolayer is expected to be highly stable, as indicated by its rather high cohesive energy, absence of soft phonon modes, and good resistance to high temperature, and thus is highly feasible for experimental realization. Remarkably, this CuB monolayer is metallic and predicted to be superconducting with an estimated critical temperature (Tc) of 4.6 K, and the critical temperature could be further enhanced by tensile strains (to 21 K at atmospheric pressure).

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Jayasree, T. K., et P. Predeep. « Nanocomposites Based on High-T_c Superconducting Ceramic 2212 BSCCO and their Properties ». Advanced Materials Research 938 (juin 2014) : 210–14. http://dx.doi.org/10.4028/www.scientific.net/amr.938.210.

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High temperature superconducting (SC) 2212 BiSrCaCuO nanoparticles were prepared by Sol-Gel method. Precursor was characterized by X-ray diffraction (XRD) and scanning Electron micrography. The superconductor nanocomposites were fabricated by nanoparticles of the SC powder with NR/LLDPE blends. The superconductive properties of the sintered samples and the nanocomposites were studied. Transition to a superconducting state around 88K appeared in the parent sample and in the composites. The scanning electron microscopic investigation of the nanostructures of SC polymer ceramic nanocomposites shown nanoscale dispersion of BSCCO in the polymer phase uniformly.

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Wu, Chuanbao, Gaoyang Zhao et Li Lei. « Enhancement of critical current density in superconducting YBa2Cu3O7−x films by nanostructure development of substrate surface using sol–gel method ». Journal of Sol-Gel Science and Technology 67, n^o 1 (17 mai 2013) : 203–7. http://dx.doi.org/10.1007/s10971-013-3068-8.

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Sosiati, H., S. Hata, T. Doi, A. Matsumoto, H. Kitaguchi et H. Nakashima. « Nanostructure characterization of Ni and B layers as artificial pinning centers in multilayered MgB2/Ni and MgB2/B superconducting thin films ». Physica C : Superconductivity 488 (mai 2013) : 1–8. http://dx.doi.org/10.1016/j.physc.2013.02.011.

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Шевцова, О. Д., М. В. Лихолетова, Е. В. Чарная, Е. В. Шевченко, Ю. А. Кумзеров et А. В. Фокин. « Динамическая восприимчивость нанокомпозита пористое стекло/Ga-In-Sn в области сверхпроводимости ». Физика твердого тела 64, n^o 1 (2022) : 40. http://dx.doi.org/10.21883/ftt.2022.01.51829.195.

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Interest to studies of gallium alloys increased recently in relation to their prospective applications for self-healing superconducting connections and wires. Special attention is focused on superconductive properties of nanostructured alloys. In the present work we studied the ac susceptibility of a porous glass/Ga-In-Sn nanocomposite within the temperature range from 1.9 to 8 K at bias fields up to 5 T. Two superconducting phase transitions were revealed with temperatures of 5.6 and 3.1 K. Phase diagrams were created. Positive curvature of the parts of critical lines was demonstrated and treated within the framework of a proximity effect model. Vortex activation barriers were found from shifts of the maxima of the imaginary parts of susceptibility with changing the ac frequency. A bend was shown on the field dependence of the activation barriers.

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Jasim, Saleh Eesaa, Mohamad Ashry Jusoh, Muhammad Aizat Kamarudin, Fahmiruddin Esa et Rodziah Nazlan. « Effect of Processing Parameters on the Morphology, Particulate, and Superconducting Properties of Electrospun YBCO Nanostructures ». Journal of Nano Research 63 (juin 2020) : 89–97. http://dx.doi.org/10.4028/www.scientific.net/jnanor.63.89.

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Superconductivity in nanostructured ceramics offers significant advantages over the conventional coarse-grained materials in view of miniaturization of superconducting electronic devices. In this paper, we report the formation of four morphologies of superconducting YBa2Cu3O7-δ (YBCO) nanostructures by electrospinning technique using polymeric polyvinyl pyrrolidone (PVP) solutions of different molecular weight and altering the total content of the metallic precursors. The morphologies prepared using this strategy are nanorods (NRs), nanogarlands (NGs), nanohierarchical (NH), and nanoparticles (NPs). Alternating current susceptibility measurements showed high critical temperatures (TC ~90 K) for the NH YBCO synthesized using PVP of the lowest molecular weight; whereas the YBCO NRs synthesized using a higher molecular weight polymer showed the lowest TC (82 K). A relationship between the particulate properties and TC was also observed – the lower is the pore size the higher is the TC. The YBCO NGs showed the highest specific surface area (7.06 m2/g) with intermediate TC (88 K). Electrospinning process appears an effective and controllable technique to produce different nanomorphologies with intrinsic properties suitable for practical applications.

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Wojnarowicz, Jacek, Sylwia Kusnieruk, Tadeusz Chudoba, Stanislaw Gierlotka, Witold Lojkowski, Wojciech Knoff, Malgorzata I. Lukasiewicz et al. « Paramagnetism of cobalt-doped ZnO nanoparticles obtained by microwave solvothermal synthesis ». Beilstein Journal of Nanotechnology 6 (30 septembre 2015) : 1957–69. http://dx.doi.org/10.3762/bjnano.6.200.

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Zinc oxide nanopowders doped with 1–15 mol % cobalt were produced by the microwave solvothermal synthesis (MSS) technique. The obtained nanoparticles were annealed at 800 °C in nitrogen (99.999%) and in synthetic air. The material nanostructure was investigated by means of the following techniques: X-ray diffraction (XRD), helium pycnometry density, specific surface area (SSA), inductively coupled plasma optical emission spectrometry (ICP-OES), extended X-ray absorption fine structure (EXAFS) spectroscopy, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and with magnetometry using superconducting quantum interference device (SQUID). Irrespective of the Co content, nanoparticles in their initial state present a similar morphology. They are composed of loosely agglomerated spherical particles with wurtzite-type crystal structure with crystallites of a mean size of 30 nm. Annealing to temperatures of up to 800 °C induced the growth of crystallites up to a maximum of 2 μm in diameter. For samples annealed in high purity nitrogen, the precipitation of metallic α-Co was detected for a Co content of 5 mol % or more. For samples annealed in synthetic air, no change of phase structure was detected, except for precipitation of Co3O4 for a Co content of 15 mol %. The results of the magentometry investigation indicated that all as-synthesized samples displayed paramagnetic properties with a contribution of anti-ferromagnetic coupling of Co–Co pairs. After annealing in synthetic air, the samples remained paramagnetic and samples annealed under nitrogen flow showed a magnetic response under the influences of a magnetic field, likely related to the precipitation of metallic Co in nanoparticles.

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Nguyen Van, Tri. « Superconductivity Mechanism in the Modulated Quantum Well of YBCO Structure ». Acta Crystallographica Section A Foundations and Advances 70, a1 (5 août 2014) : C620. http://dx.doi.org/10.1107/s2053273314093796.

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The modulated structure by high pressure and the superconductivity of YBCO compounds have been revealed over two decades [1]. However, their nature & mechanism are not yet sufficiently known. Continuing the achieved results [2-3], the present paper aims to evidence how the Quantum Electron-Magnetic Phenomenon, namely the Super-Exchange Interaction of the "active electrons", i.e. the hybridized odd electrons from the Cu ions in the Cu-Y-Cu nanolayer as a Nanowaveguide (NWG), conditions the Superconductivity of YBCO. The 1st key: The nanostructure is of Quantum nature. The active electrons behavior as the Quasi-Free Electrons (QFEs) waving in the Quantum Well (NWG), where they can be favored to a strong Super-Exchange Interaction. Thereby, two types of the spin coupled pairs can be spontaneously formed in the NWG, where just the singlet pairs will play the role of the superconducting Cooper pairs. For studying these nanoeffects, ESR can offer an especially efficacious contribution. The 2nd key: On the basis of the consequences of the Pauli principle, the singlet pair only persists if its QFE cloud overlapping path length L = nλ/2, where λ is the de Broglie wavelength of QFE conditioned by the Nanodimension of the NWG (Fig.1, left). This electron waving status corresponds to an ideal metallic phase occurring in the NWG. The 3rd key: The spin coupling brings about a temperature depending Spin Gap of the QFEs in the NWG. Just this Spin Gaps causes the superconductivity with the phase transition characteristics (Fig.1, right) that exactly and surprisingly correspond with the experimental.

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Naghib, Seyed Morteza, Yasser Zare et Kyong Yop Rhee. « A facile and simple approach to synthesis and characterization of methacrylated graphene oxide nanostructured polyaniline nanocomposites ». Nanotechnology Reviews 9, n^o 1 (28 février 2020) : 53–60. http://dx.doi.org/10.1515/ntrev-2020-0005.

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AbstractA novel, scalable methacrylated graphene oxide (MeGO) nanostructured polyaniline (PANI) nanocomposite was synthesized and electrodeposited on the surface of fluorine-doped tin oxide electrode (FTOE). The two-dimensional support maintained a suitable substrate and arrayed in a conductive polymer matrix, creating an ultra-superconductive platform with extraordinary characteristics. The versatility of the nanocomposite performance was corroborated by altering the amount of MeGO coated on FTOE and changing the charge density of electro-polymerized PANI on the substrate. This exceptional nanostructure material enabled a robust platform design that demonstrated the extraordinary performance with enhanced conductivity and stability. Charge transfer resistance (Rct) was dramatically decreased from 11,000 (for bare FTOE) to 65 (for MeGO/PANI).

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Nath, Manashi, Swastik Kar, Arup K. Raychaudhuri et C. N. R. Rao. « Superconducting NbSe2 nanostructures ». Chemical Physics Letters 368, n^o 5-6 (janvier 2003) : 690–95. http://dx.doi.org/10.1016/s0009-2614(02)01930-9.

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Smirnov, Konstantin V., Yuriy B. Vachtomin, Andrey V. Smirnov, Roman V. Ozhegov, Ivan V. Pentin, Aleksandr V. Divochii, Elizaveta V. Slivinskaya et Grigory N. Goltsman. « Terahertz and Infrared Receivers Based on Thin-Film Superconducting Nanostructures ». Siberian Journal of Physics 5, n^o 4 (1 décembre 2010) : 63–67. http://dx.doi.org/10.54362/1818-7919-2010-5-4-63-67.

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This work presents the results of the development and fabrication of sensitive and ultrafast detectors based on thinfilm superconducting nanostructures: hot-electron bolometers (HEBs) and visible and infrared superconducting singephoton detectors (SSPDs). The main operational principles of the superconducting devices are presented as well as the technology of fabrication of the detectors and their main types and parameters. The achieved record parameters of the detectors allow application of the fabricated devices to solution of various research problems in the near, middle and far IR ranges

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Niedzielski, Bjoern, Chenglong Jia et Jamal Berakdar. « Supercurrent Induced by Chiral Coupling in Multiferroic/Superconductor Nanostructures ». Nanomaterials 11, n^o 1 (13 janvier 2021) : 184. http://dx.doi.org/10.3390/nano11010184.

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We study the transport and the superconducting dynamics in a layer of type II superconductor (SC) with a normal top layer that hosts a helical magnetic ordering that gives rise to spin-current-driven ferroelectric polarization. Proximity effects akin to this heterostructure result in an anisotropic supercurrent transport and modify the dynamic properties of vortices in the SC. The vortices can be acted upon and controlled by electric gating or other means that couple to the spin ordering in the top layer, which, in turn, alter the superconducting/helical magnet coupling characteristics. We demonstrate, using the time dependent Ginzburg–Landau approach, how the spin helicity of the top layer can be utilized for pinning and guiding the vortices in the superconducting layer.

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Bagraev, N. T., L. E. Klyachkin, A. A. Koudryavtsev, A. M. Malyarenko et V. V. Romanov. « Superconducting properties of silicon nanostructures ». Semiconductors 43, n^o 11 (novembre 2009) : 1441–54. http://dx.doi.org/10.1134/s1063782609110098.

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Wu, Xing-Cai, You-Rong Tao, Qi-Xiu Gao, Chang-Jie Mao et Jun-Jie Zhu. « Superconducting TaS2−xIy hierarchical nanostructures ». Chemical Communications, n^o 28 (2009) : 4290. http://dx.doi.org/10.1039/b905168f.

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Fomin, Vladimir M., Roman O. Rezaev, Evgenii A. Levchenko, Daniel Grimm et Oliver G. Schmidt. « Superconducting properties of nanostructured microhelices ». Journal of Physics : Condensed Matter 29, n^o 39 (21 août 2017) : 395301. http://dx.doi.org/10.1088/1361-648x/aa7dbe.

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34

Gurevich, V. L., V. I. Kozub et A. L. Shelankov. « Thermoelectric effects in superconducting nanostructures ». European Physical Journal B 51, n^o 2 (mai 2006) : 285–92. http://dx.doi.org/10.1140/epjb/e2006-00218-6.

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35

Aziz, Mohsin, David Christopher Hudson et Saverio Russo. « Molybdenum-rhenium superconducting suspended nanostructures ». Applied Physics Letters 104, n^o 23 (9 juin 2014) : 233102. http://dx.doi.org/10.1063/1.4883115.

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Arutyunov, K. Yu, Sh Farhangfar, D. A. Presnov et J. P. Pekola. « Unconventional behavior of superconducting nanostructures ». Physica B : Condensed Matter 284-288 (juillet 2000) : 1848–49. http://dx.doi.org/10.1016/s0921-4526(99)02868-9.

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37

Polat, Özgür, Tolga Aytug, M. Parans Paranthaman, Keith J. Leonard, Andrew R. Lupini, Steve J. Pennycook, Harry M. Meyer et al. « An evaluation of phase separated, self-assembled LaMnO3-MgO nanocomposite films directly on IBAD-MgO as buffer layers for flux pinning enhancements in YBa2Cu3O7-δ coated conductors ». Journal of Materials Research 25, n^o 3 (mars 2010) : 437–43. http://dx.doi.org/10.1557/jmr.2010.0073.

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Technological applications of high temperature superconductors (HTS) require high critical current density, Jc, under operation at high magnetic field strengths. This requires effective flux pinning by introducing artificial defects through creative processing. In this work, we evaluated the feasibility of mixed-phase LaMnO3:MgO (LMO:MgO) films as a potential cap buffer layer for the epitaxial growth and enhanced performance of YBa2Cu3O7-δ (YBCO) films. Such composite films were sputter deposited directly on IBAD-MgO templates (with no additional homo-epitaxial MgO layer) and revealed the formation of two phase-separated, but at the same time vertically aligned, self-assembled composite nanostructures that extend throughout the entire thickness of the film. The YBCO coatings deposited on these nanostructured cap layers showed correlated c-axis pinning and improved in-field Jc performance compared to those of YBCO films fabricated on standard LMO buffers. Microstructural characterization revealed additional extended disorder in the YBCO matrix. The present results demonstrate the feasibility of novel and potentially practical approaches in the pursuit of more efficient, economical, and high performance superconducting devices.

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38

Pagano, Sergio, Nadia Martucciello, Emanuele Enrico, Eugenio Monticone, Kazumasa Iida et Carlo Barone. « Iron-Based Superconducting Nanowires : Electric Transport and Voltage-Noise Properties ». Nanomaterials 10, n^o 5 (30 avril 2020) : 862. http://dx.doi.org/10.3390/nano10050862.

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The discovery of iron-based superconductors paved the way for advanced possible applications, mostly in high magnetic fields, but also in electronics. Among superconductive devices, nanowire detectors have raised a large interest in recent years, due to their ability to detect a single photon in the visible and infrared (IR) spectral region. Although not yet optimal for single-photon detection, iron-based superconducting nanowire detectors would bring clear advantages due to their high operating temperature, also possibly profiting of other peculiar material properties. However, there are several challenges yet to be overcome, regarding mainly: fabrication of ultra-thin films, appropriate passivation techniques, optimization of nano-patterning, and high-quality electrical contacts. Test nanowire structures, made by ultra-thin films of Co-doped BaFe2As2, have been fabricated and characterized in their transport and intrinsic noise properties. The results on the realized nanostructures show good properties in terms of material resistivity and critical current. Details on the fabrication and low temperature characterization of the realized nanodevices are presented, together with a study of possible degradation phenomena induced by ageing effects.

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Shah, M. A. « Large Scale Production of MgO Nanostructures and their Possible Applications ». Materials Science Forum 760 (juillet 2013) : 69–71. http://dx.doi.org/10.4028/www.scientific.net/msf.760.69.

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The unique properties of nanomaterials have motivated the researchers to develop the simpler and inexpensive techniques to produce nanostructures of technologically important materials. Several oxide nanostructures are produced to have tremendous applications in the future and among them, magnesium oxide (MgO) is an exceptionally important material for use in catalysis, toxic waste remediation, as an additive in refractory, paint and superconducting products Fang et a. (2006).

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Seviour, R., C. J. Lambert et A. F. Volkov. « Anomalous transport in normal-superconducting and ferromagnetic-superconducting nanostructures ». Physical Review B 59, n^o 9 (1 mars 1999) : 6031–34. http://dx.doi.org/10.1103/physrevb.59.6031.

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Smetanin D. V., Likholetova M. V., Charnaya E. V., Lee M. K., Chang L. J., Shevchenko E. V., Kumzerov Yu. A. et Fokin A. V. « Superconductivity and Phase Diagram in the Nanostructured Eutectic Ga-Ag Alloy ». Physics of the Solid State 64, n^o 8 (2022) : 942. http://dx.doi.org/10.21883/pss.2022.08.54608.360.

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Here, we present a study of superconductivity in the Ga-Ag alloy embedded into porous template with pore diameter of 10 nm. The composition was close to the eutectic point in the gallium-rich range. We measured DC and AC magnetizations for temperatures from 1.8 to 10 K and magnetic fields up to 6 T. Three superconducting transitions were found at temperatures 7.05, 6.08, and 2.65 K in contrast to the bulk counterpart. Upper critical field lines were obtained. Activation barriers were evaluated from the AC data. The temperatures of the superconducting transitions were ascribed to emergence of β- and iota-Ga and of an intermetallic different from bulk Ag3Ga2. Keywords: nanostructured Ga-Ag eutectic alloy, superconducting transitions, segregated phases, DC and AC susceptibility.

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Likholetova, Marina V., Elena V. Charnaya, Evgenii V. Shevchenko, Min Kai Lee, Lieh-Jeng Chang, Yurii A. Kumzerov et Aleksandr V. Fokin. « Magnetic Studies of Superconductivity in the Ga-Sn Alloy Regular Nanostructures ». Nanomaterials 13, n^o 2 (9 janvier 2023) : 280. http://dx.doi.org/10.3390/nano13020280.

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For applications of nanolattices in low-temperature nanoelectronics, the inter-unit space can be filled with superconducting metallic alloys. However, superconductivity under nanoconfinement is expected to be strongly affected by size-effects and other factors. We studied the magnetic properties and structure of the Ga-Sn eutectic alloy within regular nanopores of an opal template, to understand the specifics of the alloy superconductivity. Two superconducting transitions were observed, in contrast to the bulk alloy. The transitions were ascribed to the segregates with the structures of tetragonal tin and a particular gallium polymorph. The superconducting-phase diagram was constructed, which demonstrated crossovers from the positive- to the common negative-curvature of the upper critical-field lines. Hysteresis was found between the susceptibilities obtained at cooling and warming in the applied magnetic field.

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Serrano, Ismael García, Javier Sesé, Isabel Guillamón, Hermann Suderow, Sebastián Vieira, Manuel Ricardo Ibarra et José María De Teresa. « Thickness-modulated tungsten–carbon superconducting nanostructures grown by focused ion beam induced deposition for vortex pinning up to high magnetic fields ». Beilstein Journal of Nanotechnology 7 (14 novembre 2016) : 1698–708. http://dx.doi.org/10.3762/bjnano.7.162.

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We report efficient vortex pinning in thickness-modulated tungsten–carbon-based (W–C) nanostructures grown by focused ion beam induced deposition (FIBID). By using FIBID, W–C superconducting films have been created with thickness modulation properties exhibiting periodicity from 60 to 140 nm, leading to a strong pinning potential for the vortex lattice. This produces local minima in the resistivity up to high magnetic fields (2.2 T) in a broad temperature range due to commensurability effects between the pinning potential and the vortex lattice. The results show that the combination of single-step FIBID fabrication of superconducting nanostructures with built-in artificial pinning landscapes and the small intrinsic random pinning potential of this material produces strong periodic pinning potentials, maximizing the opportunities for the investigation of fundamental aspects in vortex science under changing external stimuli (e.g., temperature, magnetic field, electrical current).

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Lu, Jun, Zhili Xiao, Qiyin Lin, Helmut Claus et Zhigang Zak Fang. « Low-Temperature Synthesis of Superconducting NanocrystallineMgB2 ». Journal of Nanomaterials 2010 (2010) : 1–5. http://dx.doi.org/10.1155/2010/191058.

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Magnesium diboride (MgB2) is considered a promising material for practical application in superconducting devices, with a transition temperature near 40 K. In the present paper, nanocrystalline MgB2with an average particle size of approximately 70 nm is synthesized by reacting LiBH4with MgH2at temperatures as low as 450°C. This synthesis approach successfully bypasses the usage of either elemental boron or toxic diborane gas. The superconductivity of the nanostructures is confirmed by magnetization measurements, showing a superconducting critical temperature of 38.7 K.

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45

Bang, Wonbae, W. Teizer, K. K. D. Rathnayaka, I. F. Lyuksyutov et D. G. Naugle. « Controlling superconductivity in thin film with an external array of magnetic nanostructures ». International Journal of Modern Physics B 29, n^o 25n26 (14 octobre 2015) : 1542035. http://dx.doi.org/10.1142/s0217979215420357.

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We have fabricated a new type of magnet-superconductor hybrid (MSH): an ordered array of magnetic nanorods atop a superconducting film electrically insulated from the array. Transport properties of this MSH, [Formula: see text] and [Formula: see text] are reported. We compare these results with those for a superconducting film atop an alumina template with an array of magnetic nanowires.

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46

Sealy, Cordelia. « DNA assembly creates 3D superconducting nanostructures ». Nano Today 36 (février 2021) : 101071. http://dx.doi.org/10.1016/j.nantod.2020.101071.

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Joshi, Lalit M., P. K. Rout, Sudhir Husale et Anurag Gupta. « Dissipation processes in superconducting NbN nanostructures ». AIP Advances 10, n^o 11 (1 novembre 2020) : 115116. http://dx.doi.org/10.1063/5.0021428.

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Arutyunov, K. Yu, D. A. Presnov, S. V. Lotkhov, A. B. Pavolotski et L. Rinderer. « Resistive-state anomaly in superconducting nanostructures ». Physical Review B 59, n^o 9 (1 mars 1999) : 6487–98. http://dx.doi.org/10.1103/physrevb.59.6487.

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Hayashi, M., H. Yoshioka et A. Kanda. « Superconducting proximity effect in graphene nanostructures ». Journal of Physics : Conference Series 248 (1 novembre 2010) : 012002. http://dx.doi.org/10.1088/1742-6596/248/1/012002.

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Faley, Michael I., Joshua Williams, Penghan Lu et Rafal E. Dunin-Borkowski. « TiN-NbN-TiN and Permalloy Nanostructures for Applications in Transmission Electron Microscopy ». Electronics 12, n^o 9 (8 mai 2023) : 2144. http://dx.doi.org/10.3390/electronics12092144.

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We fabricated superconducting and ferromagnetic nanostructures, which are intended for applications in transmission electron microscopy (TEM), in a commercial sample holder that can be cooled using liquid helium. Nanoscale superconducting quantum-interference devices (nanoSQUIDs) with sub-100 nm nanobridge Josephson junctions (nJJs) were prepared at a distance of ~300 nm from the edges of a 2 mm × 2 mm × 0.05 mm substrate. Thin-film TiN-NbN-TiN heterostructures were used to optimize the superconducting parameters and enhance the oxidation and corrosion resistance of nJJs and nanoSQUIDs. Non-hysteretic I(V) characteristics of nJJs, as well as peak-to-peak quantum oscillations in the V(B) characteristics of the nanoSQUIDs with an amplitude of up to ~20 µV, were obtained at a temperature ~5 K, which is suitable for operation in TEM. Electron-beam lithography, high-selectivity reactive ion etching with pure SF6 gas, and a naturally created undercut in the Si substrate were used to prepare nanoSQUIDs on a SiN membrane within ~500 nm from the edge of the substrate. Permalloy nanodots with diameters down to ~100 nm were prepared on SiN membranes using three nanofabrication methods. High-resolution TEM revealed that permalloy films on a SiN buffer have a polycrystalline structure with an average grain dimension of approximately 5 nm and a lattice constant of ~0.36 nm. The M(H) dependences of the permalloy films were measured and revealed coercive fields of 2 and 10 G at 300 and 5 K, respectively. These technologies are promising for the fabrication of superconducting electronics based on nJJs and ferromagnetic nanostructures for operation in TEM.

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