Bondarenko Stanislav I, Prokhvatilov Anatolij I, Puźniak Roman, Piętosa Jarosław, Prokhorov Andrey A, Meleshko Vladimir V, Timofeev Valeriy P, Koverya Valentin P, Gawryluk Dariusz Jakub, Wiśniewski Andrzej
B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Nauky 47, 61103 Kharkov, Ukraine.
Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland.
Materials (Basel). 2021 Dec 20;14(24):7900. doi: 10.3390/ma14247900.
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. However, matrix symmetry was not changed and the crystal was not destroyed after hydrogenation at 250 °C. Bulk , determined at the middle of the superconducting transition, which is equal to 12-13 K for the as grown FeTeSe, rose by more than 1 K after hydrogenation. The critical current density studied in magnetic field up to 70 kOe increased 4-30 times as a consequence of hydrogenation at 200 °C for 10 h. Electron paramagnetic resonance measurements also showed higher values of for hydrogenated crystals. Thermal diffusion of hydrogen into the crystals causes significant structural changes, leads to degeneration of crystal quality, and significantly alters superconducting properties. After hydrogenation, a strong correlation was noticed between the structural changes and changes in the parameters characterizing the superconducting state.
FeTeSe 单晶的性质，其临界温度（）起始于15.5 K，通过在20至250 °C温度范围内进行10 - 90小时的氢化处理而改变。发现对于已经在200 °C氢化的样品，四方基体变得不稳定且晶体对称性降低。然而，在250 °C氢化后，基体对称性未改变且晶体未被破坏。在超导转变中间确定的体临界温度，对于生长态的FeTeSe等于12 - 13 K，氢化后升高超过1 K。在高达70 kOe的磁场中研究的临界电流密度，由于在200 °C氢化10小时而增加了4 - 30倍。电子顺磁共振测量也显示氢化晶体的 值更高。氢向晶体中的热扩散导致显著的结构变化，导致晶体质量退化，并显著改变超导性质。氢化后，注意到结构变化与表征超导态的参数变化之间存在强相关性。
