Journal
NATURE COMMUNICATIONS
Volume 9, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-04326-1
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Funding
- DOE-NNSA [DE-NA0001974]
- NSF
- DOE-BES/DMSE [DE-FG02-99ER45775]
- DOE-BES [DE-AC02-06CH11357]
- National Natural Science Foundation of China [51527801, U1530402]
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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 FePX3 (X = S, Se) simultaneously undergo large in-plane lattice collapses, abrupt spin-crossovers, and insulator-metal transitions. Superconductivity emerges in FePSe3 along with the structural transition and vanishing of magnetic moment with a starting T-c similar to 2.5 K at 9.0 GPa and the maximum T-c similar to 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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