Superconductors: Properties, Technology, and Applications

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D:Materials and Processing".

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 2183

Special Issue Editor


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Guest Editor
Department of Physics, University of Maryland, College Park, MD 20742, USA
Interests: convensional and unconvensional superconductors

Special Issue Information

Dear Colleagues, 

High-temperature superconductivity could revolutionize technologies ranging from magnetically levitated trains to power transmission for renewable energy. However, to achieve such practical applications, one needs superconductors that can work above the room temperature (~300 K) to reduce the cost. So far, the copper oxide (cuprate) superconductors hold the record for the highest superconducting transition temperature (Tc ~ 133 K) among all superconductors in ambient pressure. Therefore, to obtain room temperature superconductivity, it is crucial to understand the mechanism of the superconductivity in the unconvensional high temperature superconductors. Since 1958, when the BCS theory was developed, it has been known that in low-Tc superconductors, the conducting electrons of the material are bound together in “Cooper pairs”, a lower energy state that permits electrical conduction with no resistance. The binding of the Cooper pairs is caused by a coupling between the electrons and the thermal vibrations of the atoms themselves, a complex many-body quantum effect called the electron–phonon interaction. However, the electron–phonon scattering mechanism cannot explain the Cooper pairing found in unconventional superconductors. The question is: what is the pairing mechanism in high-Tc superconductors? Therefore, understanding the mechanism of all superconductors remains one of the most important topics in condensed matter physics.This Special Issue seeks to showcase research papers review articles that focus on the properties and technical applications of superconductors.

Dr. Tarapada Sarkar
Guest Editor

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Keywords

  • superconductor
  • electrical transport
  • thermal transport
  • thin films

Published Papers (1 paper)

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Research

17 pages, 4476 KiB  
Article
Flux Pinning Properties of Single-Grain Bulk GdBCO Superconductors Processed by Different Thicknesses of Y123 Liquid Source
by Yufeng Zhang, Ziwei Lou, Penghe Zhang, Chunyan Li, Jiaying Zhang and Xiaojuan Zhang
Micromachines 2022, 13(5), 701; https://doi.org/10.3390/mi13050701 - 29 Apr 2022
Cited by 4 | Viewed by 1627
Abstract
The performance of critical current density of GdBa2Cu3O7−δ (GdBCO or Gd123) superconductor bulk has an important influence on its practical applications. In this work, four single-domain GdBCO superconductor bulks were successfully processed by the modified top-seeded melt-texture growth [...] Read more.
The performance of critical current density of GdBa2Cu3O7−δ (GdBCO or Gd123) superconductor bulk has an important influence on its practical applications. In this work, four single-domain GdBCO superconductor bulks were successfully processed by the modified top-seeded melt-texture growth method. The addition of a YBa2Cu3O7−δ (Y123) liquid source with different thicknesses, 0 mm (S0), 3 mm (S3), 5 mm (S5), 7 mm (S7), was introduced to study the influence on the superconducting properties. GdBCO bulk with the addition of the Y123 liquid source with a 3-mm thickness shows the best superconducting properties. The addition of the Y123 liquid source results in a decrease in the Gd3+ ion concentration required for Gd123 growth; thus, Gd2BaCuO5 (Gd211) particles in the liquid source need a larger self-decomposition to diffuse Gd3+ ions to Gd123 growth front, which refines the size and leads to a homogenous distribution of the Gd211 particles in the bulks. Thus, the more pinning centers of fined Gd211 particles improve the superconducting properties of GdBCO bulk. With increases in the thickness of Y123 liquid source to 5 mm and 7 mm, high RE3+ (Gd3+ and Y3+) concentration can coarsen Gd211 particles and fuse with Gd211 liquid source. The superconducting properties apparently drop. Therefore, the addition of a Y123 liquid source with a suitable thickness is a positive modification to obtain high-performance GdBCO bulk. Full article
(This article belongs to the Special Issue Superconductors: Properties, Technology, and Applications)
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