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

Yonggang Wang, Jianjun Ying, Zhengyang Zhou, Junliang Sun, Ting Wen, Yannan Zhou, Nana Li, Qian Zhang, Fei Han, Yuming Xiao, Paul Chow, Wenge Yang (), Viktor V. Struzhkin (), Yusheng Zhao () and Ho-kwang Mao
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Yonggang Wang: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Jianjun Ying: Carnegie Institution of Washington
Zhengyang Zhou: Peking University
Junliang Sun: Peking University
Ting Wen: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Yannan Zhou: Huanghe Science and Technology College
Nana Li: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Qian Zhang: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Fei Han: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Yuming Xiao: Carnegie Institution of Washington
Paul Chow: Carnegie Institution of Washington
Wenge Yang: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Viktor V. Struzhkin: Carnegie Institution of Washington
Yusheng Zhao: Southern University of Science and Technology
Ho-kwang Mao: Center for High Pressure Science and Technology Advanced Research (HPSTAR)

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract The discovery of iron-based superconductors (FeSCs), with the highest transition temperature (Tc) 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 Tc ~ 2.5 K at 9.0 GPa and the maximum Tc ~ 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.

Date: 2018
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DOI: 10.1038/s41467-018-04326-1

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