Special Issue "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 997

Special Issue Editors

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

Manuscript Submission Information

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

Published Papers (1 paper)

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A Study of the Temperature-Dependent Surface and Upper Critical Magnetic Fields in KFeSe and LaSrCuO Superconductors
Crystals 2023, 13(3), 526; https://doi.org/10.3390/cryst13030526 - 19 Mar 2023
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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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