High Temperature Superconductor

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (15 June 2023) | Viewed by 3302

Special Issue Editors


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Guest Editor
Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education, School of Physics, Northeast Normal University, Changchun 130024, China
Interests: high-pressure physics; computational physics; first-principle calculations; structure prediction; materials simulations; superconductor; superhardness materials; high-energy density materials
College of Materials Science and Engineering, Jilin University, Changchun 130012, China
Interests: structure prediction method; all-solid-state batteries; density functional theory
International Center for Computational Method & Software, College of Physics, Jilin University, Changchun 130012, China
Interests: thermal transport; lattice dynamic; material design; first-principles calculations

Special Issue Information

Dear Colleagues,

Superconductors, as a class of unusual materials, exhibit unique behaviors, such as zero resistance, and have greatly practical applications. Therefore, the research into superconductors has attracted widespread attention, especially in the fields of condensed matter physics, chemistry, and materials science. In previous research, mercury was observed to show superconductivity at 4.2 K, opening the door to finding superconductors. Subsequently, the conventional superconductor MgB2, described by the Bardeen–Cooper–Schrieffer (BCS) theory, was synthesized and had a significantly high-temperature (high-Tc) superconductivity of 39 K at ambient pressure, which motivates researchers to discover higher-Tc superconductors. Meanwhile, theoretical predictions and materials design also play a crucial role in accelerating the discovery of emerging superconductors. Since elemental metallic hydrogen is predicted to be potential high-Tc superconductor because of its high Debye temperature and strong electron–phonon coupling, investigation into the superconductivity of hydrogen has been a research hotspot. However, the extremely high metallization pressure remains a challenge. Recently, numerous binary or ternary high-Tc hydrides with lower metallization pressures and compelling hydrogen structures, including cagelike, pentagraphenelike, or tubelike motifs, have been proposed by means of chemical precompression and advanced structure search approaches, such as CALYPSO. In particular, compressed covalent sulfur hydrides and clathrate superhydrides of alkaline earth and rare earth metals are predicted to have remarkably high-Tc superconductivity, and they not only provide guidance for experiment synthesis but have also been successfully validated. Furthermore, the search for potential candidates for high-Tc materials is still underway. As a consequence, emerging superconducting materials with desirable properties are increasing in importance in the public opinion.

The goal of this Special Issue titled “High Temperature Superconductors” is to offer frontier advances in the study fields of novel excellent superconductive materials by revealing the relationship between superconductivity, structures, and electronic, electrical, etc., properties of materials. Authors are invited to contribute to the Special Issue with articles presenting exciting theoretical and experimental progress.

Dr. Shoutao Zhang
Dr. Bo Gao
Dr. Yuhao Fu
Guest Editors

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Keywords

  • high-temperature superconductivity
  • hydrides
  • emerging superconductors
  • materials simulations
  • first-principle calculations

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Published Papers (2 papers)

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Research

12 pages, 7096 KiB  
Article
Synthesis and Structural Characterization of Layered Ni+1/+2 Oxides Obtained by Topotactic Oxygen Release on Nd2−xSrxNiO4−δ Single Crystals
by Chavana Hareesh, Monica Ceretti, Philippe Papet, Alexeï Bosak, Martin Meven and Werner Paulus
Crystals 2023, 13(12), 1670; https://doi.org/10.3390/cryst13121670 - 9 Dec 2023
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Abstract
Layered nickelate oxides containing Ni1+/Ni2+ are isoelectronic to Cu2+/Cu3+ compounds and of present interest with respect to recent findings of superconductivity in a series of different compositions. It is thereby questionable why superconductivity is still rare to [...] Read more.
Layered nickelate oxides containing Ni1+/Ni2+ are isoelectronic to Cu2+/Cu3+ compounds and of present interest with respect to recent findings of superconductivity in a series of different compositions. It is thereby questionable why superconductivity is still rare to find in nickelates, compared to the much larger amount of superconducting cuprates. Anisotropic dz2 vs. dx2y2 orbital occupation as well as interface-induced superconductivity are two of the main advanced arguments. We are here interested in investigating the feasibility of synthesizing layered nickelate-type oxides, where the Ni1+/Ni2+ ratio can be tuned by oxygen and/or cation doping. Our strategy is to synthesize Sr-doped n = 1 Ruddlesden–Popper type Nd2−xSrxNiO4+δ single crystals, which are then reduced by H2 gas, forming Nd2−xSrxNiO4−δ via a topotactic oxygen release at moderate temperatures. We report here on structural studies carried out on single crystals by laboratory and synchrotron diffraction using pixel detectors. We evidence the general possibility to obtain reduced single crystals despite their increased orthorhombicity. This must be regarded as a milestone to obtain single crystalline nickelate oxides, which further on contain charge-ordering of Ni1+/Ni2+, opening the access towards anisotropic properties. Full article
(This article belongs to the Special Issue High Temperature Superconductor)
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16 pages, 1699 KiB  
Article
A Study of the Temperature-Dependent Surface and Upper Critical Magnetic Fields in KFeSe and LaSrCuO Superconductors
by Suppanyou Meakniti, Pongkaew Udomsamuthirun, Arpapong Changjan, Grittichon Chanilkul and Thitipong Kruaehong
Crystals 2023, 13(3), 526; https://doi.org/10.3390/cryst13030526 - 19 Mar 2023
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Abstract
The critical magnetic field is one of the most interesting properties of superconductors. Thus, this study aimed to investigate the surface and upper critical magnetic fields of superconductors in Fe-based and cuprate superconductors as KFeSe and LaSrCuO superconductors, respectively. The anisotropic two-band Ginzburg–Landau [...] Read more.
The critical magnetic field is one of the most interesting properties of superconductors. Thus, this study aimed to investigate the surface and upper critical magnetic fields of superconductors in Fe-based and cuprate superconductors as KFeSe and LaSrCuO superconductors, respectively. The anisotropic two-band Ginzburg–Landau method was used to generate the analytic equation. The analytics were shown for the simplified equation so that a second-order polynomial temperature-dependent equation could be applied and fitted to the experimental results of KFeSe and LaSrCuO superconductors. After that, numerical calculations were applied to find the shape of the Fermi surface, which is an important component within the band structure. It was found that the anisotropy of the Fermi surface for each band structure was affected by the upper critical magnetic field and the surface critical magnetic field to the upper critical magnetic field of the superconductors. The second-order polynomial temperature-dependent model can be applied to other superconductors to predict the surface and upper critical magnetic fields. Full article
(This article belongs to the Special Issue High Temperature Superconductor)
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