Also called FeSe, FeTe₁₋ₓSeₓ, FeTeSe, iron chalcogenide superconductors
The structurally simplest iron-based superconductor, and the one that changes most when thinned. Bulk FeSe superconducts only below about 8 K, but a single layer grown on strontium titanate shows a superconducting gap that closes near 65 K – one of the most dramatic enhancements of superconductivity by an interface ever seen. Mixing in tellurium gives a crystal whose surface becomes a topological superconductor, one of the leading places to look for Majorana states.
They are coordination polyhedra. Only complete ones are drawn.
Three layers of tetragonal FeSe. Each layer sits directly over the one below, so a single layer is the whole repeat: c = 5.52 Å. Bulk FeSe superconducts below about 8 K; a single layer grown on SrTiO3 keeps a superconducting gap to far higher temperatures. Cell at 295 K from Greenfield, Kamali, Lee and Kovnir, Chemistry of Materials 27, 588 (2015); COD 4002152.
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FeSe challenges the usual picture of iron-based superconductors: nematicity without long-range magnetic order points to orbital or quantum-disordered spin physics, and strong correlations shrink its Fermi pockets far below DFT predictions. For monolayers on SrTiO3, electron doping from the substrate and forward-scattering coupling to substrate phonons are the leading explanations. In FeTe1−xSex, a band inversion along Γ–Z makes the surface topological.
ARPES on monolayers grown in situ gives the gap-closing temperature; ex-situ transport needs capping and still differs between groups. For FeTe1−xSex, low-temperature STM with sub-meV resolution is needed to resolve vortex bound states, and inhomogeneity in the Te/Se ratio makes statistics over many vortices essential. Excess iron in FeTe changes its magnetism, so check the composition.
Not an engineering material: its most interesting states appear only in single layers on particular substrates, in ultrahigh vacuum, or at a few kelvin. Its role is scientific, as a clean test of interface superconductivity and a candidate host for Majorana-based qubits.
The newest items tagged FeSe, FeTeSe, from the news feed updated 5 Oct 2026.
A microscopic understanding of topological superconductivity (TSC) in real materials requires a materials-informed approach that integrates first-principles electronic structure, superconductivity, and topology within a unified computational framework. Here, we develop such an approach by combining density functional…
Controlling intertwined electronic orders in two-dimensional superconductors offers an effective route to answering fundamental questions and engineering new quantum devices. However, tuning the balance between competing orders typically requires complex chemistry, strain, or interface engineering. Here, we show that a…
Bond-dependent magnetic interactions, exemplified by the Kitaev model, are known to arise from the interplay between spin-orbit coupling (SOC) and specific coordination geometries, but have so far been almost exclusively identified in edge-sharing octahedral systems. Whether such interactions persist in edge-sharing…
Realizing the spin-resolved electronic properties in superconducting materials stands as a critical frontier, offering both novel fundamental physics and potential for dissipationless spin-based devices. Here, we predict a series of Janus FeX0.5Y0.5 monolayers derived from iron-based superconductors (e.g., FeSe, FeTe…
In iron-based superconductors, the dz2 orbital band typically resides far below the Fermi level and has not been considered to participate in Cooper pairing. Here, using monolayer FeSe/SrTiO3 as a model system, we demonstrate that tip-induced tensile strain controllably shifts the dz2 band toward the Fermi level…
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