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Superconducting Nanostructures and Materials
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Superconducting Nanostructures and Materials

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: closed (20 November 2022) | Viewed by 15140

Special Issue Editor

Prof. Dr. Yassine Slimani

E-Mail Website
Guest Editor
Institute for Research and Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University (IAU), Dammam, Saudi Arabia
Interests: nanomaterials; nanocomposites; magnetic nanomaterials; magnetoelectric multiferroic materials; dielectric materials; semiconductors; environmental remediation; photocatalysis; energy applications; hydrogen evolution reaction; supercapacitors; batteries; superconductivity; nanotechnology; biological activity
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Superconducting materials are promising for the revolutionization of potential energy conversion, transportation, storage, and consumption, as well as providing novel perspectives for innovative multi-functional materials and exceptional applications in electronic devices. After the discovery of high temperature superconductivity in cuprate oxide superconductors, numerous novel superconducting materials displaying outstanding performances have been performed. Several approaches have been adopted to develop superconducting materials in the form of films, tapes, bulks or nanostructures. Besides, remarkable advancements have been done in introducing engineered nanostructures within superconducting materials, which have the ability to efficiently trap the motion of vortices, and in growing heterostructures that offer multiple functionalities. The relationship between the growth, nanoscale structure, and the physical features is a vital topic to develop practical and high-quality superconducting materials.

This Special Issue aims to encompass the state-of-the-art features of the developments of superconducting nanostructures and materials, their fundamental aspects, preparation and fabrication approaches, potential applications, and first-principles calculations, etc. Contributions that deal with thin films, tapes or bulk, nano-scaled superconducting materials (nanowires, nanofibers, nanoparticles, etc.), as well as the impacts of nanomaterials on superconducting materials are highly welcomed. Both experimental and theoretical works on superconducting nanostructures and materials are encouraged to be submitted to this Special Issue. Different formats of articles including full articles, review papers and short communications are welcome for submission.

Prof. Dr. Yassine Slimani
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Superconducting materials
  • Nanomaterials
  • Flux Pinning
  • Thin films
  • Tapes
  • Energy applications
  • Computational calculations.

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Published Papers (6 papers)

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Research

14 pages, 1515 KiB  
Article
Quantifying Nonadiabaticity in Major Families of Superconductors
by Evgueni F. Talantsev
Nanomaterials 2023, 13(1), 71; https://doi.org/10.3390/nano13010071 - 23 Dec 2022
Cited by 7 | Viewed by 2095
Abstract
The classical Bardeen–Cooper–Schrieffer and Eliashberg theories of the electron–phonon-mediated superconductivity are based on the Migdal theorem, which is an assumption that the energy of charge carriers, kBTF, significantly exceeds the phononic energy, ℏωD, of the crystalline [...] Read more.
The classical Bardeen–Cooper–Schrieffer and Eliashberg theories of the electron–phonon-mediated superconductivity are based on the Migdal theorem, which is an assumption that the energy of charge carriers, kBTF, significantly exceeds the phononic energy, ℏωD, of the crystalline lattice. This assumption, which is also known as adiabatic approximation, implies that the superconductor exhibits fast charge carriers and slow phonons. This picture is valid for pure metals and metallic alloys because these superconductors exhibit ℏωDkBTF<0.01. However, for n-type-doped semiconducting SrTiO3, this adiabatic approximation is not valid, because this material exhibits ℏωDkBTF≅50. There is a growing number of newly discovered superconductors which are also beyond the adiabatic approximation. Here, leaving aside pure theoretical aspects of nonadiabatic superconductors, we classified major classes of superconductors (including, elements, A-15 and Heusler alloys, Laves phases, intermetallics, noncentrosymmetric compounds, cuprates, pnictides, highly-compressed hydrides, and two-dimensional superconductors) by the strength of nonadiabaticity (which we defined by the ratio of the Debye temperature to the Fermi temperature, TθTF). We found that the majority of analyzed superconductors fall into the 0.025≤TθTF≤0.4 band. Based on the analysis, we proposed the classification scheme for the strength of nonadiabatic effects in superconductors and discussed how this classification is linked with other known empirical taxonomies in superconductivity. Full article
(This article belongs to the Special Issue Superconducting Nanostructures and Materials)
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15 pages, 4491 KiB  
Article
Superconducting Properties of YBa2Cu3O7−δ with a Multiferroic Addition Synthesized by a Capping Agent-Aided Thermal Treatment Method
by Nur Athirah Che Dzul-Kifli, Mohd Mustafa Awang Kechik, Hussein Baqiah, Abdul Halim Shaari, Kean Pah Lim, Soo Kien Chen, Safia Izzati Abd Sukor, Muhammad Kashfi Shabdin, Muhammad Khalis Abdul Karim, Khairul Khaizi Mohd Shariff and Muralidhar Miryala
Nanomaterials 2022, 12(22), 3958; https://doi.org/10.3390/nano12223958 - 10 Nov 2022
Cited by 4 | Viewed by 1838
Abstract
A bulk YBa2Cu3O7−δ (Y-123) superconductor synthesized by a thermal treatment method was added with different weight percentages (x = 0.0, 0.2, 1.0, 1.5, and 2.0 wt.%) of BiFeO3 (BFO) nanoparticle. X-ray diffraction (XRD), alternating current susceptibility [...] Read more.
A bulk YBa2Cu3O7−δ (Y-123) superconductor synthesized by a thermal treatment method was added with different weight percentages (x = 0.0, 0.2, 1.0, 1.5, and 2.0 wt.%) of BiFeO3 (BFO) nanoparticle. X-ray diffraction (XRD), alternating current susceptibility (ACS), and field emission scanning electron microscopy (FESEM) were used to determine the properties of the samples. From the XRD results, all samples showed an orthorhombic crystal structure with a Pmmm space group. The sample x = 1.0 wt.% gave the highest value of Y-123. The high amounts of BFO degraded the crystallite size of the sample, showing that the addition did not promote the grain growth of Y-123. From ACS results, the Tc-onset value was shown to be enhanced by the addition of the BFO nanoparticle, where x = 1.5 wt.% gave the highest Tc value (91.91 K). The sample with 1.5 wt.% showed a high value of Tp (89.15 K). The FESEM analysis showed that the average grain size of the samples decreased as BFO was introduced. However, the small grain size was expected to fill in the boundary, which would help in enhancing the grain connectivity. Overall, the addition of the BFO nanoparticles in Y-123 helped to improve the superconducting properties, mainly for x = 1.5 wt.%. Full article
(This article belongs to the Special Issue Superconducting Nanostructures and Materials)
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9 pages, 3157 KiB  
Article
Synthesis and HRTEM Investigation of EuRbFe4As4 Superconductor
by Alena Yu. Degtyarenko, Igor A. Karateev, Alexey V. Ovcharov, Vladimir A. Vlasenko and Kirill S. Pervakov
Nanomaterials 2022, 12(21), 3801; https://doi.org/10.3390/nano12213801 - 28 Oct 2022
Cited by 10 | Viewed by 1820
Abstract
In the stoichiometric iron-based superconductor EuRbFe4As4, superconductivity coexists with a long-range magnetic ordering in Eu layers. Using high-resolution transmission electron microscopy (HRTEM), we observed an atomic structure of as-grown EuRbFe4As4 crystals. HRTEM shows that crystals have [...] Read more.
In the stoichiometric iron-based superconductor EuRbFe4As4, superconductivity coexists with a long-range magnetic ordering in Eu layers. Using high-resolution transmission electron microscopy (HRTEM), we observed an atomic structure of as-grown EuRbFe4As4 crystals. HRTEM shows that crystals have two-dimensional intrinsic nanoinclusions established to be the RbFe2As2 (122) phase with a volume fraction of ~5.6%. In contrast with the CaKFe4As4 compound, similar inclusions are not superconducting down to 2 K, and no second magnetization peak was observed in the magnetization measurements at low temperature with B ‖ ab. We show that the non-superconducting 122 phase nanoinclusions could act as 2D pinning centers. Full article
(This article belongs to the Special Issue Superconducting Nanostructures and Materials)
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16 pages, 6152 KiB  
Article
YBa2Cu3Oy Superconducting Ceramics Incorporated with Different Types of Oxide Materials as Promising Radiation Shielding Materials: Investigation of The Structure, Morphology, and Ionizing Radiations Shielding Performances
by Essia Hannachi, Yassine Slimani, M. H. A. Mhareb, M. I. Sayyed, M. Kh. Hamad, Y. S. Alajerami, Nidal Dwaikat, Munirah A. Almessiere and Abdulhadi Baykal
Nanomaterials 2022, 12(19), 3490; https://doi.org/10.3390/nano12193490 - 5 Oct 2022
Cited by 9 | Viewed by 2099
Abstract
New series of YBCO ceramics samples doping with different oxides such as SiO2, WO3, Al2O3, and TiO2 were fabricated to study the ionizing radiation shielding properties. The structure and morphology were explored by X-ray [...] Read more.
New series of YBCO ceramics samples doping with different oxides such as SiO2, WO3, Al2O3, and TiO2 were fabricated to study the ionizing radiation shielding properties. The structure and morphology were explored by X-ray diffraction (XRD) and scanning electron microscope (SEM). The shielding properties were investigated experimentally and theoretically to check the validity of the results. The investigated radiation shielding properties include the proton, neutron, and gamma-ray. The XRD results show the orthorhombic structure for all ceramics without any additional peaks related to WO3, SiO2, TiO2, and Al2O3. At the same time, the SEM results appear to have a significant differentiation in the granular behavior of all ceramics surfaces. The incorporation of WO3 to YBCO enhanced the ceramic density, whereas the addition of different oxides reduced the density for ceramic samples. This variation in density changed the radiation shielding results. The sample containing WO3 (YBCO-W) gives us better results in radiation shielding properties for gamma and neutron; the sample having Al2O3 (YBCO-Al) is superior in shielding results for charged particles. Finally, the possibility to use YBCO with various oxides in different ionizing radiation shielding fields can be concluded. Full article
(This article belongs to the Special Issue Superconducting Nanostructures and Materials)
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14 pages, 3164 KiB  
Article
An Improved Smart Meta-Superconductor MgB2
by Xiaopeng Zhao, Qingyu Hai, Miao Shi, Honggang Chen, Yongbo Li and Yao Qi
Nanomaterials 2022, 12(15), 2590; https://doi.org/10.3390/nano12152590 - 28 Jul 2022
Cited by 4 | Viewed by 3168
Abstract
Increasing and improving the critical transition temperature (TC), current density (JC) and the Meissner effect (HC) of conventional superconductors are the most important problems in superconductivity research, but progress has been slow for many [...] Read more.
Increasing and improving the critical transition temperature (TC), current density (JC) and the Meissner effect (HC) of conventional superconductors are the most important problems in superconductivity research, but progress has been slow for many years. In this study, by introducing the p-n junction nanostructured electroluminescent inhomogeneous phase with a red wavelength to realize energy injection, we found the improved property of smart meta-superconductors MgB2, the critical transition temperature TC increases by 0.8 K, the current density JC increases by 37%, and the diamagnetism of the Meissner effect HC also significantly improved, compared with pure MgB2. Compared with the previous yttrium oxide inhomogeneous phase, the p-n junction has a higher luminescence intensity, a longer stable life and simpler external field requirements. The coupling between superconducting electrons and surface plasmon polaritons may be explained by this phenomenon. The realization of smart meta-superconductor by the electroluminescent inhomogeneous phase provides a new way to improve the performance of superconductors. Full article
(This article belongs to the Special Issue Superconducting Nanostructures and Materials)
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7 pages, 2226 KiB  
Article
High Critical Current Density of Nanostructured MgB2 Bulk Superconductor Densified by Spark Plasma Sintering
by Yiteng Xing, Pierre Bernstein, Muralidhar Miryala and Jacques G. Noudem
Nanomaterials 2022, 12(15), 2583; https://doi.org/10.3390/nano12152583 - 27 Jul 2022
Cited by 7 | Viewed by 2238
Abstract
In situ MgB2 superconducting samples were prepared by using the spark plasma sintering method. The density of the obtained bulks was up to 95% of the theoretical value predicted for the material. The structural and microstructural characterizations of the samples were investigated [...] Read more.
In situ MgB2 superconducting samples were prepared by using the spark plasma sintering method. The density of the obtained bulks was up to 95% of the theoretical value predicted for the material. The structural and microstructural characterizations of the samples were investigated using X-ray diffraction and SEM and correlated to their superconducting properties, in particular their critical current densities, Jc, which was measured at 20 K. Extremely high critical current densities of up to 6.75 × 105 A/cm2 in the self-field and above 104 A/cm2 at 4 T were measured at 20 K, indicating that vortex pinning is very strong. This property is mainly attributed to the sample density and MgB2 nanograins in connection to the presence of MgO precipitates and areas rich in boron. Full article
(This article belongs to the Special Issue Superconducting Nanostructures and Materials)
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