School of Physical Sciences
Jawaharlal Nehru University
SPS Webinar
on
Recent progress of high Tc iron-based superconductors: 1111 and 1144
Dr. Shiv J. Singh
Institute of High-Pressure Physics, Polish Academy of Sciences, Warsaw Poland
Date: July 21, 2022 (Thursday) Time: 4:00 PM
Venue: Seminar Hall, SPS
Abstract : Superconducting materials have great potential for many practical applications, such as high-field magnet technology, loss-less electric power transmission, maglev train transportation, nuclear magnetic resonance (NMR) systems, nuclear fusion reactors, and so on. The discovery of a novel iron-based superconductor (FBS) in 2008 sparked huge interest in this field, and numerous research activities are currently going on with various kinds of FBS. FBS became the second high-Tc-superconducting family after cuprate superconductors and has more than 100 compounds that can be categorized into 5-6 families. The 1111 (REFeAsO, RE = Rare earth) and 1144 (AEAFe4As4, AE = Ca, Eu; A = K, Rb) families are the two most important families of FBS, which offer the high Tc of 58 K and 36 K as a doped and undoped system, respectively. Furthermore, the growth of these families is not an easy process, and a lot of research efforts have been reported in this direction. However, the preparation of high-quality and suitable-sized samples is still challenging and the reported results are controversial, and at the moment, a consensus has not been reached due to lack of sample issues. In this presentation, we will review the superconducting properties of the 1111 and 1144 families, as well as their growth processes, such as polycrystals and single crystals. We will also make a short comparison between them to understand the developmental issues and to resolve the basic growth problems.