High-pressure growth effects on the superconducting properties of Sm-based oxypnictide superconductors
arXiv:2412.20837 · doi:10.1016/j.ceramint.2025.01.208
Abstract
High-pressure synthesis can be an effective method for improving the sample quality of materials as well as their superconducting properties. In this paper, the synthesis process of F- doped SmFeAsO has been optimized by preparing a series of bulk SmFeAsO0.8F0.2 (Sm1111) using the high gas pressure and high-temperature synthesis (HP-HTS) method, considering various growth parameters like growth pressures (0-1 GPa) and heating time (0.5-2 h). Structural, microstructural, Raman spectroscopic, transport, and magnetic measurements are employed to comprehensively analyze these bulks and derive the conclusive findings. The parent SmFeAsO0.8F0.2 prepared by the conventional synthesis process at ambient pressure (CSP) has a transition temperature (Tc) of around 53-54 K, and the critical current density (Jc) of 103 A/cm2 at 5 K with a small amount of the impurity phases (SmOF and SmAs), consistent with previous reports. Interestingly, all bulks synthesized by HP-HTS have almost the same Tc and Jc as the parent sample. The optimal growth conditions are obtained as 900C, 1 hour, and 0.5 GPa with the sealed Ta-tube, which slightly improved the sample quality and the superconducting properties compared to other bulks grown by HP-HTS. Our study confirms that the existence of the impurity phases in the 1111 family is very robust and cannot be reduced by HP-HTS, leading to only a small variation in the observed superconducting properties of Sm1111 whether prepared by CSP or HP-HTS. This is the first comprehensive investigation of the high-pressure development of Sm1111, which shows distinct behaviour from other families of iron-based superconductors.
54 pages, 24 figures
References in corpus (16)
- High-temperature superconductivity in iron-based materials
- Superconductivity in iron-based F-doped layered quaternary compound Nd[O1-xFx]FeAs
- Superconductivity in Co-doped SmFeAsO
- Combined microstructural and magneto optical study of current flow in polycrystalline forms of Nd and Sm Fe-oxypnictides
- Interaction-induced singular Fermi surface in a high-temperature oxypnictide superconductor
- Transition Temperature and Upper Critical Field in SmFeAsO1-xFx Synthesized at Low Heating Temperatures
- Superconductivity at 52 K in hydrogen-substituted LaFeAsO1-xHx under high pressure
- The optical phonon spectrum of SmFeAsO
- Enhancement in superconducting transition temperature and upper critical field of LaO0.8F0.2FeAs with antimony doping
- Spin dependent electron-phonon interaction in SmFeAsO by low-temperature Raman spectroscopy
- High-pressure synthesis and the enhancement of the superconducting properties of FeSe0.5Te0.5
- High pressure growth and electron transport properties of superconducting SmFeAsO1-xHx single crystals
- Revisiting the electron-doped SmFeAsO: enhanced superconductivity up to 58.6 K by Th and F codoping
- High gas pressure and high-temperature synthesis (HP-HTS) technique and its impact on iron-based superconductors
- Role of magnetic dopants in the phase diagram of Sm1111 pnictides: The Mn case
- Effect of impurity phase and high-pressure synthesis on the superconducting properties of CaKFe4As4