Institute of High Pressure Physics

High pressure is known to be beneficial for enhancing the physical and magnetic properties of materials as well as improving the quality of synthesized material. The high pressure - high temperature synthesis (HP-HTS) technique developed at UNIPRESS provides a possibility to grow various kinds of materials in relatively large volumes (10-15 cm). The working principle of HP-HTS technique has been described in the recent article published by “Mohammad Azam, Manasa Manasa, Andrzej Morawski, Tomasz Cetner, and Shiv J. Singh” entitled “High Gas Pressure and High-Temperature Synthesis (HP-HTS) Technique and Its Impact on Iron-Based Superconductors” Crystals 13, 1525 (2023), Impact factor 2.7. The research team of Dr. Singh from NL-6 has studied the impact of high pressure on improvement of the superconducting properties and material quality of iron-based superconductors.

Figure: The block diagram of HP-HTS technique, presented at our institute, consisting of a three-stage oil-based compressor, high-pressure chamber (C), and a control unit monitor.

The second recenlty published paper presents a comparative study of the superconducting properties of iron-based high T_c materials by conventional synthesis process (CSP) and HP-HTS technique. This paper is published by Manasa Manasa, Mohammad Azam, Tatiana Zajarniuk, Ryszard Diduszko, Jan Mizeracki, Tomasz Cetner, Andrzej Morawski, Andrzej Wiśniewski, Shiv J. Singh, “Comparison of Gd addition effect on the superconducting properties of FeSe_0.5Te_0.5 bulks under ambient and high-pressure conditions” in Ceramics International (2023), Impact Factor: 5.2.

Figure: The variation of (a) lattice parameter ‘c’ (b) the onset transition temperature (T_c), (c) transition width (ΔT), (d) room temperature resistivity ρ_300K and (e) residual resistivity ratio RRR (ρ_300K / ρ_20K) with weight% of Gd addition for the parent FeSe_0.5Te_0.5 i.e. FeSe_0.5Te_0.5 + xGd (x = 0, 0.03, 0.05, 0.07, 0.1, and 0.2) prepared by CSP and HP-HTS