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Updated: Jun 23, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
Ambient pressure recovery of the structurally unconventional hydride Y3Fe4H20
Maélie Caussé1,2,3, Loïc Toraille4,5, Grégory Geneste6,7
1CEA, DAM, DIF, F-91297, Arpajon, France.
Abstract:
Reaching pressures in the 100 GPa range enables the synthesis of hydrogen-rich compounds with non-traditional hydrogen stoichiometries and hydrogen sublattices. The remarkable properties of such polyhydrides, including superconductivity, have attracted great interest. A crucial next step is their recovery under ambient conditions. Here we report the synthesis of Y3Fe4H20 at pressures starting from 60 GPa by compressing a hydrogenated Y-Fe compound, embedded in hydrogen in a laser-heated diamond anvil cell. Single-crystal X-ray diffraction resolves the Y3Fe4 lattice framework, while a constrained ab initio structural search is used to determine the hydrogen positions. FeH8 units form the building blocks and are connected edge-to-edge by sharing two hydrogen atoms, creating a framework that hosts Y cations. Y3Fe4H20 can be recovered at ambient conditions, where it stays metastable for tens of hours.
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