Pressure effect on superconductivity in FeSe0.5Te0.5

Sergii I. Shylin, Vadim Ksenofontov, Pavel G. Naumov, Sergey A. Medvedev, Vladimir Tsurkan, Joachim Deisenhofer, Alois Loidl, Leslie M. Schoop, Taras Palasyuk, Gerhard Wortmann, Claudia Felser

Research output: Contribution to journalArticle

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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 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.

Original languageEnglish (US)
Article number1600161
JournalPhysica Status Solidi (B) Basic Research
Volume254
Issue number1
DOIs
StatePublished - Jan 1 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Keywords

  • Mössbauer spectroscopy
  • high pressure
  • iron chalcogenides
  • superconductivity
  • synchrotron X-ray diffraction

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    Shylin, S. I., Ksenofontov, V., Naumov, P. G., Medvedev, S. A., Tsurkan, V., Deisenhofer, J., Loidl, A., Schoop, L. M., Palasyuk, T., Wortmann, G., & Felser, C. (2017). Pressure effect on superconductivity in FeSe0.5Te0.5 Physica Status Solidi (B) Basic Research, 254(1), [1600161]. https://doi.org/10.1002/pssb.201600161