Pressure effect on superconductivity in FeSe0.5Te0.5

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

doi:10.1002/pssb.201600161

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Pressure effect on superconductivity in FeSe_0.5Te_0.5

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Naumov, Pavel G.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Medvedev, Sergey A.
Sergiy Medvediev, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Shylin, S. I., Ksenofontov, V., Naumov, P. G., Medvedev, S. A., Tsurkan, V., Deisenhofer, J., et al. (2017). Pressure effect on superconductivity in FeSe_0.5Te_0.5. Physica Status Solidi B, 254(1): 1600161, pp. 1-7. doi:10.1002/pssb.201600161.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-A716-6

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 Mossbauer studies have been performed on single-crystalline samples of superconducting FeSe0.5Te0.5 with T-c=13.5K. Susceptibility data have revealed a strong increase of T-c up to 19.5K for pressures up to 1.3GPa, followed by a plateau in the T-c(p) dependence up to 5.0GPa. Further pressure increase leads to a disappearance of the superconducting state around 7.0GPa. 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 FeSe bonds. Based on structural and susceptibility data, we conclude about a common character of T-c(p) diagrams for both FeSe and FeSe0.5Te0.5 superconductors. (C) 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim