Institute of High Pressure Physics

The high-pressure growth approach is now recognized as a useful technique for enhancing the quality of materials and also their superconducting properties. The potential candidate Sm-based oxypnictide (Sm1111) exhibits the highest critical temperature of 58 K among iron-based superconductors.

In the recent study, Dr. Singh's research team from our Institute conducted the first comprehensive investigation of the high-pressure development of Sm1111. Interestingly, the high-pressure technique led to only a small variation in the observed superconducting properties of Sm1111, which is the distinct behavior from other families of iron-based superconductors. More deatil about this study can be found in the published paper by Mohammad Azam, Manasa Manasa, Tatiana Zajarniuk, Ryszard Diduszko, Taras Palasyuk, Tomasz Cetner, Andrzej Morawski, Cezariusz Jastrzębski, Andrzej Szewczyk, Michał Wierzbicki, Shiv J. Singh entitled “High-pressure growth effects on the superconducting properties of Sm-based oxypnictide superconductors” Ceramics International (Elsevier) journal (2025); https://doi.org/10.1016/j.ceramint.2025.01.208

Figure: The variation of (a) the onset transition temperature (T_c^onset) (b) the critical current density (J_c) values of various Sm1111 bulk samples prepared by high pressure growth technique with the growth pressure.

In the second research paper, Dr. Singh’s research team summarizes their findings based on the various families of iron-based superconductors under the effect of high-pressure growth techniques in the form of a short review. This paper is published by Priya Singh, Manasa Manasa, Mohammad Azam and Shiv J. Singh entitled “High-pressure growth effect on the properties of high-T_c iron-based superconductors: A short review” Cryogenics (Elsevier) 147, 104028 (2025)  https://doi.org/10.1016/j.cryogenics.2025.104028