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Advanced Superconducting Materials: Design, Properties and Applications
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Advanced Superconducting Materials: Design, Properties and Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Quantum Materials".

Deadline for manuscript submissions: closed (20 March 2024) | Viewed by 2398

Special Issue Editor

Prof. Dr. Andrey Pankratov

E-Mail Website
Guest Editor
THz Spectroscopy Department, Institute for Physics of Microstructures of RAS, Center for Quantum Technologies of NNSTU n.a. R.E, Nizhny Novgorod 603087, Russia
Interests: superconductivity; detectors; cold-electron bolometers; single photon counters; nonlinear dynamics; noise
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Superconductivity is a fundamental phenomenon that has not yet lost the interest it has attracted, leaving room for new experimental discoveries and practical use. New compounds and approaches to obtaining controlled superconductivity are constantly being discovered, which causes the need for fundamental and theoretical studies. At the same time, the challenges of practical applications require, on the one hand, moving towards the use of available nitrogen temperatures and high-temperature superconductivity, and, on the other hand, towards the region of extremely low sub-Kelvin temperatures and low-Tc superconducting materials. This applies to sensitive detectors, bolometers, calorimeters, photon counters, qubits, and qubit calibrators.

This Special Issue is intended to provide an opportunity to review progress in certain areas of superconductivity. Particular attention is paid to experimental and theoretical studies of superconducting materials and their latest applications. Full articles, review papers, and short communications are welcome for submission.

Potential topics include but are not limited to:

  • High-temperature superconductors;
  • Synthesis of superconducting materials;
  • Hybrid superconducting/ferromagnetic and superconducting/normal metal materials for engineering thin film properties;
  • Applications of low-temperature superconducting materials to design and fabrication of ultimately sensitive bolometers, microcalorimeters, photon counters and quantum information processing, as well as applications to dark matter search.

Prof. Dr. Andrey Pankratov
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. Materials 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 2600 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
  • applications of superconductivity
  • high-temperature superconductors
  • structural defects
  • detection applications

Published Papers (3 papers)

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Research

16 pages, 5259 KiB  
Article
Numerical Study on Mechanical Behavior and Electromechanical Properties of Solder-Jointed REBCO-Coated Conductors
by Tianfa Liao, Wenyuan Wang, Zhiming Chen and Mingzhi Guan
Materials 2024, 17(11), 2517; https://doi.org/10.3390/ma17112517 - 23 May 2024
Viewed by 347
Abstract
As the second-generation high-temperature superconducting conductors, rare earth–barium–copper–oxide (REBCO) coated conductor (CC) tapes have good potential as high-field and high-energy superconductors. In superconducting applications, several joints are required for conjugating comparatively short REBCO CC tapes. Soldering lap joints are the simplest and most [...] Read more.
As the second-generation high-temperature superconducting conductors, rare earth–barium–copper–oxide (REBCO) coated conductor (CC) tapes have good potential as high-field and high-energy superconductors. In superconducting applications, several joints are required for conjugating comparatively short REBCO CC tapes. Soldering lap joints are the simplest and most commonly applied REBCO CC joints. In addition to joint resistance, the mechanical behavior and electromechanical properties are also crucial for superconducting applications. In this paper, the electromechanical properties and mechanical behaviors of soldering lap joints at 77 K under a self-field were studied. The mechanical behavior was addressed by using a full three-dimensional multilayer elastic–plastic finite element model (FEM) with REBCO CC tape main layers and solder connecting layers. Then, the electromechanical properties were analyzed by using Gao’s strain-Ic degradation general model on the basis of the FEM results. Both the mechanical behavior and electromechanical properties were verified by experimental results. The effects of soldering lap conditions including lap length, soldering thickness and lap style on the electromechanical properties and mechanical behaviors were discussed. The results indicate that shorter overlap lengths and a thinner solder can reduce the premature degradation of Ic due to stress concentrations nearby the joint edges; moreover, the irreversible critical strain is significantly higher in the back-to-back joint approach compared to the widely used face-to-face joint approach. Full article
(This article belongs to the Special Issue Advanced Superconducting Materials: Design, Properties and Applications)
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17 pages, 4391 KiB  
Article
Investigation of Hafnium Thin Films for Design of TES Microcalorimeters
by Victoria Yu. Safonova, Anna V. Gordeeva, Anton V. Blagodatkin, Dmitry A. Pimanov, Anton A. Yablokov, Olga L. Ermolaeva and Andrey L. Pankratov
Materials 2024, 17(1), 222; https://doi.org/10.3390/ma17010222 - 30 Dec 2023
Cited by 2 | Viewed by 868
Abstract
Hafnium is a superconductor with a transition temperature slightly above 100 mK. This makes it attractive for such applications as microcalorimeters with high energy resolution. We report the superconducting properties of Hf films of thicknesses ranging from 60 to 115 nm, deposited on [...] Read more.
Hafnium is a superconductor with a transition temperature slightly above 100 mK. This makes it attractive for such applications as microcalorimeters with high energy resolution. We report the superconducting properties of Hf films of thicknesses ranging from 60 to 115 nm, deposited on Si and Al2O3 substrates by electron beam evaporation. Besides that, we fabricated and measured combinations of hafnium with thin layers of normal metals, decreasing the critical temperature by the proximity effect. The critical temperature of the studied films varied from 56 to 302 mK. We have observed a significant change in the critical temperature of some films over time, which we propose to prevent by covering hafnium films with a thin layer of titanium. Full article
(This article belongs to the Special Issue Advanced Superconducting Materials: Design, Properties and Applications)
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16 pages, 3856 KiB  
Article
Analysis of Critical Current Dependence on Specimen Length and Crack Size Distribution in Cracked Superconductor
by Shojiro Ochiai and Hiroshi Okuda
Materials 2024, 17(1), 176; https://doi.org/10.3390/ma17010176 - 28 Dec 2023
Viewed by 714
Abstract
In order to describe the dependence of critical current on specimen length and crack size distribution in the superconducting tape with cracks of different sizes, a Monte Carlo simulation and a model analysis were carried out, employing the model specimens of various lengths [...] Read more.
In order to describe the dependence of critical current on specimen length and crack size distribution in the superconducting tape with cracks of different sizes, a Monte Carlo simulation and a model analysis were carried out, employing the model specimens of various lengths constituted of multiple short sections with a crack per each. The model analysis was carried out to evaluate the effects of the two factors on the critical current of a specimen. Factor 1 is the size of the largest crack in a specimen, and Factor 2 is the difference in crack size among all sections at the critical voltage of critical current. Factors 1 and 2 were monitored by the smallest ligament parameter among all sections constituting the specimen and by the number of sections equivalent to the section containing the largest crack at the critical voltage of the critical current of the specimen, respectively. The research using the monitoring method revealed quantitatively that the critical current-reducing effect with increasing specimen length is caused by the increase in the size of the largest crack (Factor 1), and also, the critical current-raising effect is caused by the increase in the difference of crack size (Factor 2). As the effect of Factor 1 is larger than that of Factor 2, the critical current decreases with increasing specimen length. With the present approach, the critical current reducing and raising effects under various crack size distributions were evaluated quantitatively as a function of specimen length, and the specimen length-dependence of critical current obtained by the Monte Carlo simulation was described well. Full article
(This article belongs to the Special Issue Advanced Superconducting Materials: Design, Properties and Applications)
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