The Impact of Hydrogenation on Structural and Superconducting Properties of FeTeSe Single Crystals.

Properties of FeTeSe single crystals, with the onset of critical temperature () at 15.5 K, were modified via hydrogenation performed for 10-90 h, at temperatures ranging from 20 to 250 °C. It was found that the tetragonal matrix became unstable and crystal symmetry lowered for the samples hydrogenated already at 200 °C.