Instytut Wysokich Ciśnień

FeSe is the simplest iron-based superconductor and has a layered structure with alternating Fe and Se layers. Dr. Singh's research group from our Institute has studied the chemical pressure effect by substitution of the Pr element at Fe sites and As-substitution at Se-sites in FeSe compound. Conventional synthesis process (CSP) at ambient pressure and high-pressure growth technique were used. Interestingly, Pr doping at Fe sites preserves T_c^onset and improves J_c of FeSe_0.5Te_0.5 regardless of the doping contents and growth conditions. More detail about this study can be found in the recently published paper by: Priya Singh, Manasa Manasa, Mohammad Azam, Tatiana Zajarniuk, Svitlana Stelmakh, Taras Palasyuk, Jan Mizeracki, Tomasz Cetner, Andrzej Morawski, Cezariusz Jastrzębski, Michał Wierzbicki, Shiv J. Singh entitled “Praseodymium doping effect on the superconducting properties of FeSe_0.5Te_0.5 bulks under ambient and high-pressure growth conditions” Physica C: Superconductivity and its Applications (Elsevier) 633, 1354729 (2025); https://doi.org/10.1016/j.physc.2025.1354729

Figure: The variation of (a) the onset transition temperature (T_c) (b) the transition width (ΔT) (c) the room temperature resistivity (ρ_300K) (d) residual resistivity ratio (RRR = ρ_300K / ρ_20K) (e) the critical current density (J_c) at 7 K for H = 0 T (closed symbol) and 3 T (open symbol) for Pr_xFe_1-xSe_0.5Te_0.5 bulks prepared by high pressure growth method with respect to the nominal contents (x) of Pr substitutions or Gd- additions.

In the second research paper, Dr. Singh’s research group has concluded their findings on the effects of As-substitution at Se sites in the FeSe system. The observed superconducting transition temperature is approximately 12 K, which is higher than that of the parent compound FeSe_1-x. This paper is published by: Priya Singh, Manasa Manasa, Mohammad Azam, Tatiana Zajarniuk, Konrad Kwatek, Tomasz Cetner, Andrzej Morawski, Jan Mizeracki and Shiv J. Singh entitled “Synthesis and characterizations of arsenic doped FeSe bulks” Journal of Superconductivity and Novel Magnetism 38, 109 (2025) https://doi.org/10.1007/s10948-025-06952-5

We are delighted to share that the work coauthored by the researchers from our Institute, published in physica status solidi (b) basic solid state physics, has ranked within the top 10% of most-viewed papers published by the journal in 2023*:

Origins of Electrical Compensation in Si-Doped HVPE GaN, Prozheev, I., Iwinska, M., Sochacki, T., Bockowski, M., Bès, R. and Tuomisto, F. Phys. Status Solidi B, 260, 2200568 (2023). https://doi.org/10.1002/pssb.202200568

This achievement is a testament to the recognition of this work within the community. Congratulations!

View the award certificate.

*Among work published in physica status solidi (b) basic solid state physics between January 1, 2023 - December 31, 2023, up to 12 months after publication.

Z dumą informujemy, że pracownik naszego Instytutu, dr Konrad Sakowski został wyróżniony przez Rektora Uniwersytetu Warszawskiego za inspirujące badania naukowe oraz wybitne osiągnięcia. Uroczyste wręczenie dyplomów odbyło się w Pałacu Kazimierzowskim w środę 2 kwietnia. Dr Konrad Sakowski oprócz pracy naukowej w IWC PAN jest również adiunktem na Wydziale Matematyki, Informatyki i Mechaniki UW.

Gratulujemy Konradowi tego zasłużonego wyróżnienia i życzymy dalszych sukcesów w pracy. Jesteśmy dumni, że jest częścią naszego zespołu.

10^th International Conference on Superconductivity and Magnetism - ICSM 2025 will be held in Fethiye-Oludeniz, Turkey from 26^th April to 3^rd May 2025. This conference will cover a wide range of physics topics, including superconductivity, magnetism, and quantum materials and technological communities, and create networking opportunities and strengthen connections between all career levels. This year again, Dr. Shiv Singh from our Institute is organizing a special session: “Advances in Iron-based Superconductors: Growth, fundamental and applied research”. You can find more details about this session here.

Furthermore, in this conference, Dr. Shiv Singh will have an invited talk entitled "Impurity Effects on the Superconducting Properties of Stoichiometric CaKFe4As4 by Conventional and High-pressure Growth Methods”. Recently, Dr. Singh’s research team has proved that the high-pressure growth technique can be an effective method to enhance the superconducting properties of high-T_c superconductors as well as the sample quality. More details about the program and the speakers can be found here.