Structural phase transitions and superconductivity in Fe 1+δSe0.57Te0.43 at ambient and elevated pressures

Nathalie C. Gresty, Yasuhiro Takabayashi, Alexey Y. Ganin, Martin T. McDonald, John B. Claridge, Duong Giap, Yoshikazu Mizuguchi, Yoshihiko Takano, Tomoko Kagayama, Yasuo Ohishi, Masaki Takata, Matthew J. Rosseinsky, Serena Margadonna, Kosmas Prassides

Research output: Contribution to journalArticlepeer-review

99 Citations (Scopus)


The ternary iron chalcogenide, Fe1.03Se0.57Te 0.43 is a member of the recently discovered family of Fe-based superconductors with an ambient pressure Tc of 13.9 K and a simple structure comprising layers of edge-sharing distorted Fe(Se/Te)4 tetrahedra separated by a van der Waals gap. Here we study the relationship between its structural and electronic responses to the application of pressure. Tc depends sensitively on applied pressure attaining a broad maximum of 23.3 K at ∼3 GPa. Further compression to 12 GPa leads to a metallic but nonsuperconducting ground state. High-resolution synchrotron X-ray diffraction shows that the superconducting phase is metrically orthorhombic at ambient pressure but pressurization to ∼3 GPa leads to a structural transformation to a more distorted structure with monoclinic symmetry. The exact coincidence of the crystal symmetry crossover pressure with that at which Tc is maximum reveals an intimate link between crystal and electronic structures of the iron chalcogenide superconductors.

Original languageEnglish
Pages (from-to)16944-16952
Number of pages9
JournalJournal of the American Chemical Society
Issue number46
Publication statusPublished - 2009


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