- Warszawska Szkoła Doktorska
- Studia doktoranckie
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Iron-based superconductors: Chemical pressure effects by ambient and high-pressure growth
The properties of high Tc superconductors can be significantly improved by the chemical pressure effect and high-pressure synthesis process. Dr. Singh's research group (NL-6) has published three very interesting IEEE articles that summarize the impact of chemical pressure on iron-based superconductors (FBS) using both ambient and high-pressure growth methods. In the first paper, researchers show that the superconducting properties of the stoichiometric CaKFe4As4 (1144) are improved by high-gas pressure and high-temperature synthesis (HP-HTS) process. The transition temperature is increased up to 35.2 K with a transition width of 1 K, which is comparable to 1144 single crystals. Additionally, the critical current density (Jc) is enhanced by almost one order of magnitude compared with 1144 prepared by the conventional synthesis process at ambient pressure (CSP). This study is published by Manasa Manasa, Mohammad Azam, Tatiana Zajarniuk, Ryszard Diduszko, Tomasz Cetner, Andrzej Morawski, Andrzej Wiśniewski, Shiv J. Singh entitled “Enhancement of Superconducting Properties of Polycrystalline CaKFe4As4 by High-Pressure Growth” (IEEE Transactions on Applied Superconductivity (2023)) DOI: 10.1109/TASC.2023.3345821 Figure 1: The variation of (a) the onset transition (Tconset) (b) transition width (ΔT) (c) the residual resistivity ratio (RRR = ρ300 K /ρ40 K and (d) the critical current density (Jc) at 0 T and 5 T at 5 K for the samples prepared at different pressures for CaKFe4As4 bulks. The data are also included from the previous reports for 1144 bulks. |
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