6533b85cfe1ef96bd12bd5b8

RESEARCH PRODUCT

Pressure effect on superconductivity in FeSe0.5Te0.5

Sergii I. ShylinVadim KsenofontovPavel G. NaumovSergey A. MedvedevVladimir TsurkanJoachim DeisenhoferAlois LoidlLeslie M. SchoopTaras PalasyukGerhard WortmannClaudia Felser

subject

Superconductivity (cond-mat.supr-con)Condensed Matter - Materials ScienceCondensed Matter - SuperconductivityMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciences

description

Due to the simple layered structure, isostructural FeSe and FeSe0.5Te0.5 are clue compounds for understanding the principal mechanisms of superconductivity in the family of Fe-based superconductors. High-pressure magnetic, structural and M\"ossbauer studies have been performed on single-crystalline samples of superconducting FeSe0.5Te0.5 with Tc = 13.5 K. Susceptibility data have revealed a strong increase of Tc up to 19.5 K for pressures up to 1.3 GPa, followed by a plateau in the Tc(p) dependence up to 5.0 GPa. Further pressure increase leads to a disappearance of the superconducting state around 7.0 GPa. X-ray diffraction and M\"ossbauer studies explain this fact by a tetragonal-to-hexagonal structural phase transition. M\"ossbauer parameters of the non-superconducting high-pressure phase indicate less covalency of Fe-Se bonds. Based on structural and susceptibility data we conclude about a common character of Tc(p) diagrams for both FeSe and FeSe0.5Te0.5 superconductors.

yearjournalcountryeditionlanguage
2016-01-01
https://dx.doi.org/10.48550/arxiv.1609.06179