Pressure effect on superconductivity in FeSe0.5Te0.5

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 sa...

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Bibliographic Details
Published in:physica status solidi (b) 2017-01, Vol.254 (1), p.n/a
Main 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
Format: Article
Language:English
Subjects:
high pressure
iron chalcogenides
Mössbauer spectroscopy
superconductivity
synchrotron X‐ray diffraction
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Summary: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 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.
ISSN:0370-1972
1521-3951
DOI:10.1002/pssb.201600161