Rola domieszek magnetycznych w nadprzewodnikach oksypniktydowych na bazie prazeodymu (Pr)

Prof. Shiv J. Singh’s research group at the Laboratory of Superconductors and Hydrogen Technologies (NL-6) has published a new study investigating the impact of magnetic impurities on superconductivity in the iron-based oxypnictide superconductor PrFeAs(O,F).

The work provides important insights into the interplay between magnetism and superconductivity in iron-pnictide materials. Using structural characterization, Raman spectroscopy, density functional theory (DFT) calculations, and magnetic and transport measurements, the team systematically studied the series PrFe1-xMnₓAsO0.7F0.3. The results demonstrate that manganese atoms are incorporated into the superconducting FeAs layers, where they act as magnetic scattering centers. Increasing Mn concentration progressively suppresses superconductivity, reducing the superconducting transition temperature from 48 K and completely destroying the superconducting state at 10% Mn substitution. The study further reveals that Mn substitution weakens superconducting coherence, lowers the upper critical field and critical current density, and promotes carrier localization and insulating-like behavior at low temperatures. These findings highlight the crucial role of magnetic impurities in governing the electronic and superconducting properties of iron-based superconductors.

The results have been published in:

Priya Singh, Konrad Kwatek, Tatiana Zajarniuk, Taras Palasyuk, Cezariusz Jastrzębski, Andrzej Szewczyk, Michał Wierzbicki, and Shiv J. Singh, “Effect of Mn substitution on superconductivity in PrFeAs(O,F): Role of magnetic impurities”, Journal of Physics and Chemistry of Solids 218, 113933 (2026) (Impact Factor: 5.9).

https://doi.org/10.1016/j.jpcs...