Pressure effect on superconductivity in FeSe0.5Te0.5

Shylin, S.; Ksenofontov, V.; Naumov, P.; Medvedev, S.; Tsurkan, V.; Deisenhofer, J.; Loidl, A.; Schoop, L.; Palasyuk, T.; Wortmann, G.; Felser, C.

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Pressure effect on superconductivity in FeSe_0.5Te_0.5

Shylin, S., Ksenofontov, V., Naumov, P., Medvedev, S., Tsurkan, V., Deisenhofer, J., et al. (2017). Pressure effect on superconductivity in FeSe_0.5Te_0.5. physica status solidi (b), 254(1): 1600161.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000E-D03A-6 Version Permalink: https://hdl.handle.net/21.11116/0000-000E-D03B-5

Genre: Journal Article

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Shylin, S., Author
Ksenofontov, V., Author
Naumov, P., Author
Medvedev, S., Author
Tsurkan, V., Author
Deisenhofer, J., Author
Loidl, A., Author
Schoop, L.¹, Author
Palasyuk, T., Author
Wortmann, G., Author
Felser, C., Author

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1Max Planck Society, ou_persistent13

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Free keywords: high pressure; iron chalcogenides; Mossbauer spectroscopy; superconductivity; synchrotron X-ray diffraction

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

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Language(s): eng - English

Dates: Date issued: 2017

Publication Status: Issued

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Rev. Type: Peer

Identifiers: eDoc: 734815
ISI: 000393320600012

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Title: physica status solidi (b)

Source Genre: Journal

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Publ. Info: WEINHEIM : WILEY-V C H VERLAG GMBH

Pages: - Volume / Issue: 254 (1) Sequence Number: 1600161 Start / End Page: - Identifier: ISSN: 0370-1972