Special Issue "Metallic Superconductors - The Workhorses of Superconductivity"
A special issue of Metals (ISSN 2075-4701).
Deadline for manuscript submissions: 10 August 2020.
Interests: Superconductors; Bulk superconductor magnets; Magnetic imaging; Magnetic recording
Superconductivity was first discovered in metal superconductors, and the first real applications brought up by the first intermetallic alloys still play an important role until now (NbTi, Nb3Sn). Moreover, the development of MgB2 which reaches the highest superconducting transition temperature of approx. 38 K (without external pressure) enables new research possibilities for applications at ~20 K provided by cryo-cooling systems. MgB2 can replace high-Tc superconductor-based materials due to the fact that a relatively cheap manufacturing process is possible to be applied, and there are no (expensive) rare-earth materials involved. However, MgB2 shares many features with previous materials like Nb3Sn. The ever present quest for higher critical currents requires intense research concerning the flux pinning sites created artificially (mechanical deformation or chemical doping), by irradiation and newly developed processing techniques.
Another interesting aspect of metallic superconductors is that they still provide new insights to superconductivity, both theoretically and experimentally. Among such observations is the paramagnetic Meissner effect (PME) observed firstly in Nb disks, and since then also in other metallic systems. Further, two-dimensional systems based on metallic materials like NbSe2, Bi2Te3, etc. offer a simple experimental access to these systems. Therefore, the research on metallic superconductors still offers many possibilities and new developments.
Prof. Dr. Michael Koblischka
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 papers will be 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. Metals is an international peer-reviewed open access monthly 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 1600 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.
- Artificial pinning centers (APC)
- Critical currents, flux pinning
- Flux jumps
- Rare-earth free superconductors
- Trapped field magnets
- Sparc plasma sintering
- CVD growth
- 2D materials
- Topological superconductors
- Paramagnetic Meissner effect
- Magnetic imaging of flux structures
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Article Type: Review
Article Title: Magnetic recording of superconducting states
Author: Prof. Alejandro V. Silhanek
Article Type: Review
Article Title: Review of the paramagnetic Meissner effect (PME) in metallic superconductors
Author: Prof. Dr. Michael Koblischka
Article Type: Article
Article Title: Ternary Molybdenum Chalcogenide superconducting wires
Author: Dr. B. Seeber
Ternary Molybdenum Chalcogenide (TMC) superconducting wires were intensely studied worldwide before the discovery of High Temperature Superconductors (HTS). TMCs are Low Temperature Superconductors (LTS) with a critical temperature up to 15 K and upper critical fields in the range of 50 T @ 4.2 K, e.g. the compound PbMo6S8. This is more than twice of Nb3Sn. However, the most important feature of TMCs is the combination of a small field dependence of the critical current (< 40 T) and the low price of raw materials. Then a TMC superconducting wire may be cost efficient above 5 T and 12 T with respect to NbTi and Nb3Sn, respectively. In comparison to HTS, TMC is about one order of magnitude less expensive and many physical properties, important for applications, are superior. Up to now TMCs suffers under of a not sufficient critical current density, Jc. In this contribution aspects regarding an improvement of Jc of TMC conductors are discussed. According an experimentally observed master scaling curve for the pinning force vs. magnetic field, a prospective critical current density can be calculated. The result is confirmed by an independent Jc measurement of a high quality TMC bulk sample. It is expected that a new manufacturing process of TMC wires (US and European patents are granted recently) will substantially improve the critical current density. TMC wires don’t need a reaction heat treatment like Nb3Sn wires and can be wound into a magnet almost like NbTi. Together with cost considerations, this paves the way for a next generation superconductor.