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- Title
Pressure effect on superconductivity in FeSe<sub>0.5</sub>Te<sub>0.5</sub>.
- Authors
Shylin, Sergii I.; Ksenofontov, Vadim; Naumov, Pavel G.; Medvedev, Sergey A.; Tsurkan, Vladimir; Deisenhofer, Joachim; Loidl, Alois; Schoop, Leslie M.; Palasyuk, Taras; Wortmann, Gerhard; Felser, Claudia
- Abstract
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 Mössbauer 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 Mössbauer studies explain this fact by a tetragonal-to-hexagonal structural phase transition. Mössbauer parameters of the non-superconducting high-pressure phase indicate less covalency of FeSe 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.
- Subjects
IRON-based superconductors; SUPERCONDUCTIVITY; PRESSURE; MOSSBAUER spectroscopy; MAGNETIC susceptibility; X-ray diffraction
- Publication
Physica Status Solidi (B), 2017, Vol 254, Issue 1, pn/a
- ISSN
0370-1972
- Publication type
Article
- DOI
10.1002/pssb.201600161