Praseodymium doping effect on the superconducting properties of FeSeTe bulks under ambient and high-pressure growth conditions
arXiv:2410.06159 · doi:10.1016/j.physc.2025.1354729
Abstract
A series of Pr-doped FeSeTe (FePrSeTe; to 0.3) bulks are prepared by conventional synthesis process at ambient pressure (CSP), and high gas pressure and high temperature synthesis (HP-HTS) methods. These bulks are well characterized by structural and microstructural analysis, Raman spectroscopy, transport, and magnetic measurements. The HP-HTS process of the parent bulks has enhanced the onset transition temperature () by 1.5 K and the critical current density () by two orders of magnitude compared to the CSP method. Pr-doped FeSeTe up to 10% doping content prepared, either CSP or HP-HTS, slightly increases the unit cell volume, and high-pressure growth produces an almost pure superconducting phase, which confirms the successful Pr-doping at Fe sites. Raman spectroscopy measurements and DFT calculations suggest the substitution of Pr-atoms in the interlayer spacing of Fe(Se,Te) lattice. High-pressure growth of FePrSeTe also makes the sample less dense compared to the parent sample grown by HP-HTS. Transport and magnetic measurements depict that Tconset is almost unaffected by Pr-doping, whereas of Pr-doped FeSeTe is enhanced by one order of magnitude relative to the parent sample developed by CSP but lower than that of the parent sample grown by HP-HTS. Hence, Pr-doping at Fe sites preserves and improves of FeSeTe regardless of the doping contents and growth conditions. These results are promising for the practical application of iron-based superconductors to improve properties without affecting through CSP process and congruent with discoveries from other superconductors, like cuprates and MgB.
50 pages, 1 table, 15 figures, Author's list updated
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