Synthesis, phase stability, structural and physical properties of 11-type iron chalcogenides

Abstract

This article reviews recent experimental investigations on two binary Fe-chalcogenides: FeSe and Fe${}_{1+y}$Te. The main focus is on synthesis, single crystal growth, chemical composition, as well as on the effect of excess iron on structural, magnetic, and transport properties of these materials. The structurally simplest Fe-based superconductor Fe${}_{1+x}$Se with a critical temperature $T_c\approx$ 8.5 K undergoes a tetragonal to orthorhombic phase transition at a temperature $T_s\approx$ 87 K. No long-range magnetic order is observed down to the lowest measured temperature in Fe${}_{1+x}$Se. On the other hand, isostructural Fe${}_{1+y}$Te displays a complex interplay of magnetic and structural phase transitions in dependence on the tuning parameter such as excess amount of Fe or pressure, but it becomes a superconductor only when Te is substituted by a sufficient amount of Se. We summarize experimental evidence for different competing interactions and discuss related open questions.

14 pages, 12 figures, Feature Article, Part of Special Issue on Iron-Based High Temperature Superconductors

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Cited by in corpus (8)

• Superconducting gap structure of FeSe
• Nodal gaps in the nematic superconductor FeSe from heat capacity
• Electronic structure of FeS
• Impurity-induced bound states inside the superconducting gap of FeSe
• Influence of disorder on the signature of pseudogap and multigap superconducting behavior in FeSe
• Competing spin density wave, collinear, and helical magnetism in Fe1+xTe
• Pressure-induced ferromagnetism due to an anisotropic electronic topological transition in Fe1.08Te
• Molecular beam epitaxy preparation and in situ characterization of FeTe thin films