Advances in Superconducting Films

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Thin Films".

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 7929

Special Issue Editor

CNR-SPIN, c/o Università degli Studi di Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano (SA), Italy
Interests: superconductivity; thin films and heterostructures; electrical transport properties

Special Issue Information

Dear Colleagues,

Research on superconducting films is continuously fostered by the progress and development of deposition and characterization techniques, making possible the reliable realization of superconducting materials with specific properties. These characteristics are strongly dependent on the deposition methods, fabrication conditions, confinement imposed by the reduced thickness, composition, microstructures, as well as the proper choice of substrates. The control of these parameters makes it possible to tailor the superconducting films’ properties, which, at extremely reduced scales, may be different from the bulk. In addition, one of the challenging issues in the field of superconducting films is to design and explore the coupling between materials with different properties by profiting from the capability to realize heterostructures consisting of very thin layers of different materials (magnetic, semiconducting, organic, etc.) coupled to the superconductor through high-quality contacts. In this way, in order to discover new, rich physics and functionalities, the reciprocal influence of the different phases can be fine-tuned by changing the materials, layer thicknesses, and their configuration and topology.

Single films and hybrids provide platforms for the study of fundamental physics and for engineering novel properties and functionalities as well as consolidating established ones, possibly with a greater technological impact.

The scope of this Special Issue is to present the most recent developments in the field of superconducting films, which may be of interest to both experimentalists and theoreticians working in this field. In particular, the topics of interest include, but are not limited to:

  • Progress in deposition techniques and film characterization;
  • Novel materials;
  • Unconventional superconductors;
  • Thin film hybrids and interfaces;
  • Superconductivity at the nanoscale;
  • Applications and devices;
  • Films and hybrids as platforms for research on fundamental physics.

Dr. Carla Cirillo
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. Coatings 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 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.

Published Papers (3 papers)

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Research

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11 pages, 601 KiB  
Article
On the Superconducting Critical Temperature of Heavily Disordered Interfaces Hosting Multi-Gap Superconductivity
by Giulia Venditti, Marco Grilli and Sergio Caprara
Coatings 2022, 12(1), 30; https://doi.org/10.3390/coatings12010030 - 27 Dec 2021
Cited by 1 | Viewed by 1843
Abstract
LaAlO3/SrTiO3 interfaces are a nice example of a two-dimensional electron gas, whose carrier density can be varied by top- and back-gating techniques. Due to the electron confinement near the interface, the two-dimensional band structure is split into sub-bands, and more [...] Read more.
LaAlO3/SrTiO3 interfaces are a nice example of a two-dimensional electron gas, whose carrier density can be varied by top- and back-gating techniques. Due to the electron confinement near the interface, the two-dimensional band structure is split into sub-bands, and more than one sub-band can be filled when the carrier density increases. These interfaces also host superconductivity, and the interplay of two-dimensionality, multi-band character, with the possible occurrence of multi-gap superconductivity and disorder calls for a better understanding of finite-bandwidth effects on the superconducting critical temperature of heavily disordered multi-gap superconductors. Full article
(This article belongs to the Special Issue Advances in Superconducting Films)
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14 pages, 2067 KiB  
Article
Superconducting Order Parameter Nucleation and Critical Currents in the Presence of Weak Stray Fields in Superconductor/Insulator/Ferromagnet Hybrids
by Vasiliy N. Kushnir, Serghej L. Prischepa, Michela Trezza, Carla Cirillo and Carmine Attanasio
Coatings 2021, 11(5), 507; https://doi.org/10.3390/coatings11050507 - 25 Apr 2021
Cited by 2 | Viewed by 2380
Abstract
The stray fields produced by ferromagnetic layers in Superconductor/Insulator/Ferromagnet (S/I/F) heterostructures may strongly influence their superconducting properties. Suitable magnetic configurations can be exploited to manipulate the main parameters of the hybrids. Here, the nucleation of the superconducting phase in an external magnetic field [...] Read more.
The stray fields produced by ferromagnetic layers in Superconductor/Insulator/Ferromagnet (S/I/F) heterostructures may strongly influence their superconducting properties. Suitable magnetic configurations can be exploited to manipulate the main parameters of the hybrids. Here, the nucleation of the superconducting phase in an external magnetic field that periodically oscillates along the film width is studied on the base of the numerical solution of the linearized system of Usadel equations. In addition, the effect of the magnetic configuration of the F-layer on the temperature dependence of the critical current density, Jc(T), is investigated in the framework of the Ginzburg–Landau phenomenological theory on the base of the oscillating model of a stray field. By following this approach, the Jc(T) dependence of a Nb/SiO2/PdNi trilayer is reproduced for different magnetic configurations of the PdNi layer. Full article
(This article belongs to the Special Issue Advances in Superconducting Films)
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Review

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16 pages, 3378 KiB  
Review
A Review of Electronic Transport in Superconducting Sr2RuO4 Junctions
by Muhammad Shahbaz Anwar and Jason W. A. Robinson
Coatings 2021, 11(9), 1110; https://doi.org/10.3390/coatings11091110 - 14 Sep 2021
Cited by 4 | Viewed by 3022
Abstract
We review electronic transport in superconducting junctions with Sr2RuO4. Transport measurements provide evidence for chiral domain walls and, therefore, chiral superconductivity in superconducting Sr2RuO4, but so far, the symmetry of the underlying superconducting state remains [...] Read more.
We review electronic transport in superconducting junctions with Sr2RuO4. Transport measurements provide evidence for chiral domain walls and, therefore, chiral superconductivity in superconducting Sr2RuO4, but so far, the symmetry of the underlying superconducting state remains inconclusive. Further studies involving density of states measurements and spin-polarised transport in local/non-local Sr2RuO4 junctions with magnetic materials could lead to fundamental discoveries and a better understanding of the superconducting state. Full article
(This article belongs to the Special Issue Advances in Superconducting Films)
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