Superconductivity of Nanostructured Pb&lt;SUB&gt;7&lt;/SUB&gt;Bi&lt;SUB&gt;3&lt;/SUB&gt; Films Doped by Ce

Stolyarov, V. S.; Zverev, V. N.; Postnova, E. Yu.; Strukov, G. V.; Струкова, Г. К.; Rusanov, A. Yu.; Shmitko, I. M.

doi:10.1166/jnn.2012.4930

Cited by 2 publications

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“…At the same time, studies of the characteristics of these low dimensional structures, whose properties at low temperatures begin to notice ably obey quantum laws (up to the appearance of mac roscopic quantum effects), seem very important from the fundamental point of view. Figure 1 shows the images of layer nanofilaments, which are promising for superconductive electronic applications [4,5], grown in porous matrices, and a micrograph of a whis ker substrate for the third generation of the HTSC wires. Studying the basic physical principles of the development of the third generation of superconduct ing wires is the main subject of this article.…”

Section: Introductionmentioning

confidence: 99%

The physical basis of the fabrication of the third generation of high-temperature superconducting wires on quartz substrates

et al. 2015

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The problem of the fabrication of third generation high temperature superconductors (HTSCs) that are designed for the transmission of electric energy and the creation of nanoelectronic devices is studied in this work. The issues of the fabrication of dielectric substrates for the third generation wires are considered. The technology of HTSC film deposition on the quartz substrates is presented. Complex studies of sputtering of the buffer and superconducting YBa 2 Cu 3 O 7 ⎯ δ (YBCO) layers were performed. The results of studies of electrophysical properties of the HTSC films on the quartz substrates are discussed.

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Section: Introductionmentioning

confidence: 99%

The physical basis of the fabrication of the third generation of high-temperature superconducting wires on quartz substrates

et al. 2015

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Characterization of structure and superconducting properties of low-temperature phase of Pb-Bi alloy films

Tian¹,

Wang²,

Du³

et al. 2021

Acta Phys. Sin.

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Lead-bismuth (Pb-Bi) alloys, as a superconducting material, have been widely studied at their superconducting transition temperatures and the critical magnetic fields for different composition ratios. Most of experimental studies focused on the stable ε phase formed at high temperatures, but less on the Pb-Bi alloys grown at low temperatures. So far, the structural and superconducting properties of the low-temperature Pb-Bi phases are far from good understanding. Here, we report our investigation of structural and superconducting properties of a low-temperature phase of Pb-Bi alloy. The Pb-Bi alloy films with a nominal thickness of about 6 nm are prepared by co-depositing Bi and Pb on Bi(111)/Si(111)-(7 × 7) substrates at a low temperature of 100 K followed by annealing at a treatment of 200 K for 2 h. The structural and superconducting properties of the Pb-Bi alloy films are characterized in situ by using low-temperature scanning tunneling microscopy/spectroscopy (STM/STS). It is observed that the spatially separated phases of nearly pure Bi(111) domains and Pb1–xBix alloy domains are formed in the films, where these phases can be identified by their distinct differences in the atomic structure and the distributions of step heights in the atomically resolved STM images, as well as by their distinguished STS spectra. The Pb1–xBix alloy phase presents the structure of Pb(111), in which about x ≈ 0.1 Bi is substituted for Pb. The STS spectra show that the Pb1–xBix alloy phase is superconducting, with a transition temperature Tc = 7.77 K derived from the variable-temperature measurements. This transition temperature is higher than that in pure Pb film (6.0–6.5 K), which can be well explained by the Mattias rules, with considering the fact that the average number of valance electrons increases after Bi atoms with five valance-electrons have been substituted for Pb atoms with four valance-electrons. The analysis shows that the ratio <inline-formula><tex-math id="M1">\begin{document}$ 2\Delta (0)/{k_{\rm{B}}}{T_{\rm{C}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="17-20210482_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="17-20210482_M1.png"/></alternatives></inline-formula> is about 4.94 with the superconducting gap <inline-formula><tex-math id="M2">\begin{document}$ \varDelta (0) = 1.66$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="17-20210482_M2.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="17-20210482_M2.png"/></alternatives></inline-formula> meV at 0 K, indicating that the Pb1–xBix alloy is a strongly-coupled superconductor. The non-superconducting Bi(111) and the superconducting Pb1–xBix alloy domains form an in-plane superconductor-normal metal-superconductor (S-N-S) Josephson junction. The proximity effect in the Bi(111) domains is measured at different N-S junctions, which suggests that the lateral superconducting penetration length in Bi(111) might be affected by the area of the quasi-two-dimensional interface. The superconducting gap in the Bi(111) region with a narrow width of 23 nm in an S-N-S Josephson junction is found to be greatly enhanced due to the existence of multiple Andreev reflections. Since Bi can host potential topological properties, the lateral Bi(111)-Pb1–xBix heterostructures, because of the existing proximity effect, could have potential applications in exploring the novel topological and superconducting phenomena.

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Superconductivity of Nanostructured Pb<SUB>7</SUB>Bi<SUB>3</SUB> Films Doped by Ce

Cited by 2 publications

References 4 publications

The physical basis of the fabrication of the third generation of high-temperature superconducting wires on quartz substrates

The physical basis of the fabrication of the third generation of high-temperature superconducting wires on quartz substrates

Characterization of structure and superconducting properties of low-temperature phase of Pb-Bi alloy films

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