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Due to the simple layered structure, isostructural FeSe and FeSe 0.5 Te 0.5  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 FeSe 0.5 Te 0.5  with  T  c  = 13.5 K. Susceptibility data have revealed a strong increase of  T  c  up to 19.5 K for pressures up to 1.3 GPa, followed by a plateau in the  T  c ( 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  T  c ( p ) diagrams for both FeSe and FeSe 0.5 Te 0.5  superconductors.

Pressure effect on superconductivity in FeSe 0.5 Te 0.5