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Advances in Cuprates and Iron-Based Superconductors: Physics, Properties, and Applications
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Advances in Cuprates and Iron-Based Superconductors: Physics, Properties, and Applications

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

Deadline for manuscript submissions: 20 June 2025 | Viewed by 5969

Special Issue Editors

Dr. Armando Galluzzi

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Guest Editor
Department of Physics “E.R. Caianiello”, University of Salerno, Via Giovanni Paolo II, 132, I-84084 Fisciano, Salerno, Italy
Interests: superconductivity; iron-based superconductors; magnetic properties of low- and high-temperature superconductors; vortex dynamics; flux pinning properties; magnetism; magnetic measurements; magnetic materials; nanomaterials; magnetic nanoparticles
Special Issues, Collections and Topics in MDPI journals
Dr. Massimiliano Polichetti

E-Mail Website
Guest Editor
Department of Physics “E.R. Caianiello”, University of Salerno, Via Giovanni Paolo II, 132, I-84084 Fisciano, Salerno, Italy
Interests: condensed matter physics; superconductivity; AC and DC magnetic properties; multi-harmonic AC susceptibility; vortex dynamics; magnetic materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The discovery of superconductivity in cuprates was received with great enthusiasm due to the fact that Tc can exceed the temperature of liquid nitrogen in many cases. Nevertheless, due to issues such as high anisotropy values, superconductor–insulator–superconductor (SIS) grain boundary junction, etc., materials like YBCO or BSCCO have never been fully exploited for superconductivity power applications. Nevertheless, the interest in these materials has always existed. Furthermore, despite having a lower Tc than cuprates, iron-based superconductors (IBSs) exhibit higher Jc and Hc2 values along with lower values of anisotropy and superconductor–normal–superconductor (SNS) grain boundary junction, and thus have been proposed as a valid alternative to cuprates.

For this Special Issue, we intend to collect articles detailing the most recent advances in the understanding of the physics and superconducting properties of both cuprates and iron-based superconductors, as well as those studying superconducting parameters with use in power applications, such as Jc, Hirr, Hc2, etc. Moreover, experimental and theoretical studies on pinning properties, vortex dynamics, methods of material synthesis, different characterization techniques, etc., will be considered for publication in the Special Issue. Regular articles, communications, and reviews are all welcome.

Dr. Armando Galluzzi
Dr. Massimiliano Polichetti
Guest Editors

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

  • superconductivity
  • cuprates
  • iron-based superconductors
  • material synthesis
  • structural characterization
  • electrical measurements
  • magnetic measurements
  • thermal measurements
  • vortex dynamics
  • pinning properties
  • vortex phase diagrams

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Published Papers (6 papers)

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Research

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16 pages, 1313 KiB  
Article
The Shrinking Fermi Liquid Scenario for Cuprates Under the Scrutiny of Optical Conductivity Measurements
by Sergio Caprara, Carlo Di Castro, Giovanni Mirarchi, Götz Seibold and Marco Grilli
Materials 2024, 17(23), 5849; https://doi.org/10.3390/ma17235849 - 28 Nov 2024
Viewed by 497
Abstract
In a recent paper [B. Michon et al., Nat. Commun. (2023) 14:3033], optical conductivity experiments in cuprate superconductors were shown to display scaling properties consistent with the Marginal Fermi Liquid theory. Here, we argue that the temperature regime studied in these experiments does [...] Read more.
In a recent paper [B. Michon et al., Nat. Commun. (2023) 14:3033], optical conductivity experiments in cuprate superconductors were shown to display scaling properties consistent with the Marginal Fermi Liquid theory. Here, we argue that the temperature regime studied in these experiments does not allow for distinguishing between Marginal Fermi Liquid and Shrinking Fermi Liquid. In the latter scenario, which we recently proposed and which applies near a quantum critical point, dynamical fluctuations of the order parameter with a short correlation length mediate a nearly isotropic scattering among the quasiparticles over the entire Fermi surface leading to strange metal behavior. If the damping of these nearly local fluctuations increases by decreasing the temperature, the Fermi liquid regime shrinks and the strange metal behavior is extended to the lowest temperatures. This Shrinking Fermi Liquid scenario has many similarities and some differences with respect to the Marginal Fermi Liquid theory. In particular, we show that the approximate scaling properties of the optical conductivity in some high-frequency regimes predicted by the Shrinking Fermi Liquid scenario account for a very good description of the experimental data. Full article
(This article belongs to the Special Issue Advances in Cuprates and Iron-Based Superconductors: Physics, Properties, and Applications)
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14 pages, 9541 KiB  
Article
Magnetic Memory Effects in BaFe2(As0.68P0.32)2 Superconducting Single Crystal
by Alina M. Badea (Ionescu), Ion Ivan, Corneliu F. Miclea, Daniel N. Crisan, Armando Galluzzi, Massimiliano Polichetti and Adrian Crisan
Materials 2024, 17(21), 5340; https://doi.org/10.3390/ma17215340 - 31 Oct 2024
Viewed by 714
Abstract
Among many iron-based superconductors, isovalently substituted BaFe2(As1−xPx)2 displays, for x ≈ 0.3, apart from the quite usual Second Magnetization Peak (SMP) in the field dependence of the critical current density, an unusual peak effect in the [...] Read more.
Among many iron-based superconductors, isovalently substituted BaFe2(As1−xPx)2 displays, for x ≈ 0.3, apart from the quite usual Second Magnetization Peak (SMP) in the field dependence of the critical current density, an unusual peak effect in the temperature dependence of the critical current density in the constant field, which is related to the rhombic-to-square (RST) structural transition of the Bragg vortex glass (BVG). By using multi-harmonic AC susceptibility investigations in three different cooling regimes—field cooling, zero-field cooling, and field cooling with measurements during warming up—we have discovered the existence of a temperature region in which there is a pronounced magnetic memory effect, which we attributed to the direction of the structural transition. The observed huge differences in the third harmonic susceptibility at low and high AC frequencies indicates the difference in the time-scale of the structural transition in comparison with the timescale of the vortex excitations. Our findings show that the RST influence on the vortex dynamics goes beyond the previously observed influence on the onset of the SMP. Full article
(This article belongs to the Special Issue Advances in Cuprates and Iron-Based Superconductors: Physics, Properties, and Applications)
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11 pages, 4971 KiB  
Article
Iron-Based Superconductors for High-Field Applications: Realization of High Engineering Critical Current Density
by Peng Yang, He Huang, Meng Han, Cong Liu, Chao Yao, Yanwei Ma and Dongliang Wang
Materials 2024, 17(21), 5306; https://doi.org/10.3390/ma17215306 - 31 Oct 2024
Viewed by 987
Abstract
Iron-based superconductors have strong potential for magnet applications through their very high upper critical field, low anisotropy and manufacturability through the powder-in-tube (PIT) route. The engineering critical current density (Je) is a key parameter for measuring the maximum current density [...] Read more.
Iron-based superconductors have strong potential for magnet applications through their very high upper critical field, low anisotropy and manufacturability through the powder-in-tube (PIT) route. The engineering critical current density (Je) is a key parameter for measuring the maximum current density that superconducting materials can withstand in practical applications. It serves as a bridge between theoretical research and practical applications of superconductors and has great significance in promoting the development and application of superconducting technology. In this study, Ag sheathed Ba0.6K0.4Fe2As2 (Ba-122) iron-based superconducting tapes were prepared by using the process of drawing, flat rolling and heat treatment by hot pressing (HP). For the first time, the filling factor of the tapes increased to about 40%, leading to a reduction in the volume fraction of Ag, consequently lowering the overall cost. The optimal parameters for achieving high transport Je were obtained by comparing the effects of different HP pressures on the properties and micro-morphology of the tapes. The prepared mono-filament tapes are capable of carrying the transport Je of 4.1 × 104 A/cm2 (Ic = 350 A) at 4.2 K, 10 T, marking the highest Je reported for Ba-122 wires and tapes to date. Our results show that high transport Je can be obtained in Ba-122 superconducting tapes, and iron-based superconductors have a promising future in practical applications. Full article
(This article belongs to the Special Issue Advances in Cuprates and Iron-Based Superconductors: Physics, Properties, and Applications)
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8 pages, 806 KiB  
Communication
Exploring Unconventional Electron Distribution Patterns: Contrasts Between FeSe and FeSe/STO Using an Ab Initio Approach
by Chi-Ho Wong and Rolf Lortz
Materials 2024, 17(21), 5204; https://doi.org/10.3390/ma17215204 - 25 Oct 2024
Viewed by 774
Abstract
For more than a decade, the unusual distribution of electrons observed in ARPES (angle-resolved photoemission spectroscopy) data within the energy range of ~30 meV to ~300 meV below the Fermi level, known as the ARPES energy range, has remained a puzzle in the [...] Read more.
For more than a decade, the unusual distribution of electrons observed in ARPES (angle-resolved photoemission spectroscopy) data within the energy range of ~30 meV to ~300 meV below the Fermi level, known as the ARPES energy range, has remained a puzzle in the field of iron-based superconductivity. As the electron–phonon coupling of FeSe/SrTiO3 is very strong, our investigation is centered on exploring the synergistic interplay between spin-density waves (SDW) and charge-density waves (CDW) with differential phonons at the interface between antiferromagnetic maxima and minima under wave interference. Our analysis reveals that the synergistic energy is proportional to the ARPES energy range, as seen in the comparison between FeSe and FeSe/SrTiO3. This finding may suggest that the instantaneous interplay between these intricate phenomena may play a role in triggering the observed energy range in ARPES. Full article
(This article belongs to the Special Issue Advances in Cuprates and Iron-Based Superconductors: Physics, Properties, and Applications)
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9 pages, 4143 KiB  
Article
Fe(Se,Te) Thin Films Deposited through Pulsed Laser Ablation from Spark Plasma Sintered Targets
by Michela Iebole, Valeria Braccini, Cristina Bernini, Andrea Malagoli, Nicola Manca, Alberto Martinelli, Matteo Cialone, Marina Putti, Shiv J. Singh, Giovanna Latronico and Paolo Mele
Materials 2024, 17(11), 2594; https://doi.org/10.3390/ma17112594 - 28 May 2024
Cited by 1 | Viewed by 992
Abstract
Iron-based superconductors are under study for their potential for high-field applications due to their excellent superconducting properties such as low structural anisotropy, large upper critical fields and low field dependence of the critical current density. Between them, Fe(Se,Te) is simple to be synthesized [...] Read more.
Iron-based superconductors are under study for their potential for high-field applications due to their excellent superconducting properties such as low structural anisotropy, large upper critical fields and low field dependence of the critical current density. Between them, Fe(Se,Te) is simple to be synthesized and can be fabricated as a coated conductor through laser ablation on simple metallic templates. In order to make all the steps simple and fast, we have applied the spark plasma sintering technique to synthesize bulk Fe(Se,Te) to obtain quite dense polycrystals in a very short time. The resulting polycrystals are very well connected and show excellent superconducting properties, with a critical temperature onset of about 16 K. In addition, when used as targets for pulsed laser ablation, good thin films are obtained with a critical current density above 105 A cm−2 up to 16 T. Full article
(This article belongs to the Special Issue Advances in Cuprates and Iron-Based Superconductors: Physics, Properties, and Applications)
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Review

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27 pages, 17974 KiB  
Review
Properties and Applications of Iron–Chalcogenide Superconductors
by Jianlong Zhao, Junsong Liao, Chiheng Dong, Dongliang Wang and Yanwei Ma
Materials 2024, 17(13), 3059; https://doi.org/10.3390/ma17133059 - 21 Jun 2024
Viewed by 1227
Abstract
Iron–chalcogenide superconductors continue to captivate researchers due to their diverse crystalline structures and intriguing superconducting properties, positioning them as both a valuable platform for theoretical investigations and promising candidates for practical applications. This review begins with a comprehensive overview of the fabrication techniques [...] Read more.
Iron–chalcogenide superconductors continue to captivate researchers due to their diverse crystalline structures and intriguing superconducting properties, positioning them as both a valuable platform for theoretical investigations and promising candidates for practical applications. This review begins with a comprehensive overview of the fabrication techniques employed for various iron–chalcogenide superconductors, accompanied by a summary of their phase diagrams. Subsequently, it delves into the upper critical field, anisotropy, and critical current density. Furthermore, it discusses the successful fabrication of meters-long coated conductors and explores their applications in superconducting radio-frequency cavities and coils. Finally, several prospective avenues for future research are proposed. Full article
(This article belongs to the Special Issue Advances in Cuprates and Iron-Based Superconductors: Physics, Properties, and Applications)
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