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Emergent superconductivity in an iron-based honeycomb lattice initiated by pressure-driven spin-crossover

Yonggang WangGeophysical LaboratoryJianjun YingHPCAT, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, IL, 60439, USAZhengyang ZhouCollege of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, ChinaJunliang SunCollege of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, ChinaTing Bin WenCenter for High Pressure Science and Technology Advanced Research (HPSTAR), 100094, Beijing, ChinaYannan ZhouInstitute of Nanostructured Functional Materials, Huanghe Science and Technology College, 450006, Zhengzhou, ChinaNana LiCenter for High Pressure Science and Technology Advanced Research (HPSTAR), 100094, Beijing, ChinaQian ZhangCenter for High Pressure Science and Technology Advanced Research (HPSTAR), 100094, Beijing, ChinaFei HanCenter for High Pressure Science and Technology Advanced Research (HPSTAR), 100094, Beijing, ChinaYuming XiaoHPCAT, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, IL, 60439, USAPaul ChowGeophysical LaboratoryWenge YangHPSynC, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, IL, 60439, USA. [email protected]Viktor V. StruzhkinGeophysical Laboratory, Carnegie Institution of Washington, Washington, DC, 20015, USAYusheng ZhaoSouthern University of Science and Technology, 518055, Shenzhen, China. [email protected]Ho‐kwang MaoCenter for High Pressure Science and Technology Advanced Research (HPSTAR), 100094, Beijing, China

2018en

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Litsenziya: cc-by

ABI

Annotatsiya

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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DOI: 10.1038/s41467-018-04326-1

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