Nature Communications · 2018 · 186 citations · 38 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMaterials PhysicsSolid State PhysicsFerromagnetismMagnetic Properties Of SolidsMagnetism In SolidsMetalsPhase TransitionsSuperconducting MaterialsHigh-temperature SuperconductivityHigh-temperature SuperconductorsInsulator-to-metal TransitionIron-based AlloysIron-based SuperconductorsLayered MaterialsMetal-insulator TransitionPhase Transition Temperature
Abstract The discovery of iron-based superconductors (FeSCs), with the highest transition temperature ( T c ) up to 55 K, has attracted worldwide research efforts over the past ten years. So far, all these FeSCs structurally adopt FeSe-type layers with a square iron lattice and superconductivity can be generated by either chemical doping or external pressure. Herein, we report the observation of superconductivity in an iron-based honeycomb lattice via pressure-driven spin-crossover. Under compression, the layered FeP X 3 ( X = S, Se) simultaneously undergo large in-plane lattice collapses, abrupt spin-crossovers, and insulator-metal transitions. Superconductivity emerges in FePSe 3 along with the structural transition and vanishing of magnetic moment with a starting T c ~ 2.5 K at 9.0 GPa and the maximum T c ~ 5.5 K around 30 GPa. The discovery of superconductivity in iron-based honeycomb lattice provides a demonstration for the pursuit of transition-metal-based superconductors via pressure-driven spin-crossover.
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Yoichi Kamihara, Takumi Watanabe, Masahiro Hirano et al. · Journal of the American Chemical Society · 2008 · 7.9K citations
Conventional superconductivity at 203 kelvin at high pressures in the sulfur hydride system
M. I. Eremets, I. A. Troyan, Vadim Ksenofontov et al. · Nature · 2015 · 2.7K citations · Full text