6533b858fe1ef96bd12b57ca
RESEARCH PRODUCT
Pressure effect on superconductivity in FeSe0.5Te0.5
Alois LoidlVadim KsenofontovGerhard WortmannVladimir TsurkanSergii I. ShylinTaras PalasyukPavel G. NaumovSergey A. MedvedevJoachim DeisenhoferLeslie M. SchoopClaudia Felsersubject
DiffractionSuperconductivityMaterials scienceCondensed matter physics02 engineering and technology021001 nanoscience & nanotechnologyCondensed Matter PhysicsPlateau (mathematics)01 natural sciencesElectronic Optical and Magnetic MaterialsLayered structurePhase (matter)0103 physical sciencesMössbauer spectroscopyPressure increaseIsostructural010306 general physics0210 nano-technologydescription
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 Mossbauer 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 Mossbauer studies explain this fact by a tetragonal-to-hexagonal structural phase transition. Mossbauer 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-09-19 | physica status solidi (b) |