Layered Superconductors III

A special issue of Condensed Matter (ISSN 2410-3896). This special issue belongs to the section "Superconductivity".

Deadline for manuscript submissions: closed (30 September 2022) | Viewed by 10294

Special Issue Editor

Department of Physics, Tokyo Metropolitan University, Hachioji 192-0397, Japan
Interests: superconductivity; thermoelectric material; new material; low-dimensional material; superconducting wire; crystal structure analysis
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Special Issue Information

Dear Colleagues,

Layered superconductors have attracted a great deal of attention due to the emergence of high-Tc and unconventional superconductivity. Thus, the discovery of new layered superconductors and an understanding of superconductivity mechanisms are very important for exploring new high-Tc superconductors. In addition, layered superconductors have been studied as candidate materials for topological superconductors. In this Special Issue, we focus on the exploration of novel layered superconductors, such as Cu-based, Fe-based, Bi-based, Ti-based, organic, and other novel layered superconductors. In addition, superconducting properties of single crystal, high-quality bulk, and thin-film samples will be explored in this Special Issue.

Prof. Dr. Yoshikazu Mizuguchi
Guest Editor

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Keywords

  • layered superconductor
  • new superconductor
  • high-Tc superconductor
  • superconductivity mechanisms
  • single crystal
  • bulk
  • thin film
  • high pressure
  • superconductivity application

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Published Papers (4 papers)

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Research

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8 pages, 1368 KiB  
Article
MgB2 Thin Films Fabricated by Pulsed Laser Deposition Using Nd:YAG Laser in an In Situ Two-Step Process
Condens. Matter 2022, 7(3), 48; https://doi.org/10.3390/condmat7030048 - 02 Aug 2022
Cited by 3 | Viewed by 1880
Abstract
Magnesium diboride (MgB2) thin films on r-cut sapphire (r-Al2O3) single crystals were fabricated by a precursor, which was obtained at room temperature via a pulsed laser deposition (PLD) method using a Nd:YAG laser, and [...] Read more.
Magnesium diboride (MgB2) thin films on r-cut sapphire (r-Al2O3) single crystals were fabricated by a precursor, which was obtained at room temperature via a pulsed laser deposition (PLD) method using a Nd:YAG laser, and an in situ postannealing process. The onset superconducting transition, Tconset, and zero-resistivity transition, Tczero, were observed at 33.6 and 31.7 K, respectively, in the MgB2 thin films prepared by a Mg-rich target with a ratio of Mg:B = 3:2. The critical current density, Jc, calculated from magnetization measurements reached up to 0.9 × 106 A cm−2 at 20 K and 0 T. The broad angular Jc peak was found at 28 K when the magnetic fields were applied in a direction parallel to the film surface (θ = 90°). This could be indicative of the granular structure with randomly oriented grains. Our results demonstrate that this process is a promising candidate for the fabrication of MgB2 superconducting devices. Full article
(This article belongs to the Special Issue Layered Superconductors III)
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11 pages, 2982 KiB  
Article
Estimation of the Grüneisen Parameter of High-Entropy Alloy-Type Functional Materials: The Cases of REO0.7F0.3BiS2 and MTe
Condens. Matter 2022, 7(2), 34; https://doi.org/10.3390/condmat7020034 - 18 Apr 2022
Viewed by 2586
Abstract
In functional materials such as thermoelectric materials and superconductors, the interplay between functionality, electronic structure, and phonon characteristics is one of the key factors to improve functionality and to understand the underlying mechanisms. In the first part of this article, we briefly review [...] Read more.
In functional materials such as thermoelectric materials and superconductors, the interplay between functionality, electronic structure, and phonon characteristics is one of the key factors to improve functionality and to understand the underlying mechanisms. In the first part of this article, we briefly review investigations on lattice anharmonicity in functional materials on the basis of the Grüneisen parameter (γG). We show that γG can be a good index for large lattice anharmonicity and for detecting a change in anharmonicity amplitude in functional materials. Then, we show original results on the estimation of γG for recently developed high-entropy alloy-type (HEA-type) functional materials with a layered structure and a NaCl-type structure. As a common trend for those two systems with two- and three-dimensional structures, we found that γG increased with a slight increase in the configurational entropy of mixing (ΔSmix) and then decreased with increasing ΔSmix in the high-entropy region. Full article
(This article belongs to the Special Issue Layered Superconductors III)
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8 pages, 1542 KiB  
Article
Electrical Transport Measurements on Layered La(O,F)BiS2 under Extremely High Pressure
Condens. Matter 2022, 7(1), 25; https://doi.org/10.3390/condmat7010025 - 02 Mar 2022
Cited by 1 | Viewed by 2207
Abstract
Layered La(O,F)BiS2 exhibits drastic enhancements of the superconducting transition temperature (Tc) under high pressure among the BiS2-based superconducting family. However, the high-pressure application beyond a high-Tc phase of the monoclinic structure has not been conducted. [...] Read more.
Layered La(O,F)BiS2 exhibits drastic enhancements of the superconducting transition temperature (Tc) under high pressure among the BiS2-based superconducting family. However, the high-pressure application beyond a high-Tc phase of the monoclinic structure has not been conducted. In this study, the electrical transport properties in La(O,F)BiS2 single crystal are measured under high pressures up to 83 GPa. An insulating phase without superconductivity is observed under a higher-pressure region above 16 GPa. Moreover, the sample exhibits metallicity and superconductivity above 60 GPa. The newly observed hidden semiconducting phase and reentrant superconductivity have attracted much attention in BiS2-based compounds. Full article
(This article belongs to the Special Issue Layered Superconductors III)
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Review

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13 pages, 2508 KiB  
Review
Superconductivity in the α-Form Layer Structured Metal Nitride Halide
Condens. Matter 2022, 7(2), 33; https://doi.org/10.3390/condmat7020033 - 01 Apr 2022
Cited by 7 | Viewed by 2956
Abstract
Layered metal nitride halides MNX (M = Ti, Zr, Hf; X = Cl, Br, I) have two polymorphs, including α- and β-forms, which have the FeOCl and SmSI structures, respectively. These compounds are band insulators and become metals and show [...] Read more.
Layered metal nitride halides MNX (M = Ti, Zr, Hf; X = Cl, Br, I) have two polymorphs, including α- and β-forms, which have the FeOCl and SmSI structures, respectively. These compounds are band insulators and become metals and show superconductivity after electron doping by intercalating alkali metals between the layers. The superconductivity of β-form had been extensively characterized from decades ago, but it is not easy to consistently interpret all experimental results using conventional phonon-mediated Bardeen–Cooper–Schriefer mechanisms. The titanium compound TiNCl crystallizes only in the α-form structure. TiNCl also exhibits superconductivity as high as ~16 K after electron doping by intercalating metals and/or organic basis. It is important to compare the superconductivity of different M–N networks. However, α-form compounds are vulnerable to moisture, unlike β-form ones. The intercalation compounds are even more sensitive to humid air. Thus, there are few experimental studies on the superconducting mechanism of α-form, although it has been discussed for exotic Cooper-pairing mechanisms. This short review gathers the recent progress in experimental studies of TiNCl. Full article
(This article belongs to the Special Issue Layered Superconductors III)
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