Hydrogen Pentagraphenelike Structure Stabilized by Hafnium: A High-Temperature Conventional Superconductor.
Kresin, Vladimir Z
Physical review letters
American Physical Society
MetadataShow full item record
Xie, H., Yao, Y., Feng, X., Duan, D., Song, H., Zhang, Z., Jiang, S., et al. (2020). Hydrogen Pentagraphenelike Structure Stabilized by Hafnium: A High-Temperature Conventional Superconductor.. Physical review letters, 125 (21), 217001. https://doi.org/10.1103/physrevlett.125.217001
Recent discovery of H3S and LaH10 superconductors with record high superconducting transition temperatures, Tc, at high pressure, has fueled the search for room-temperature superconductivity in the compressed superhydrides. Here we introduce a new class of high Tc hydrides with a novel structure and unusual properties. We predict the existence of an unprecedented hexagonal HfH10, with remarkably high value of Tc (around 213-234 K) at 250 GPa. As concerns the novel structure, the H ions in HfH10 are arranged in clusters to form a planar “penta-graphene-like” sublattice. The layered arrangement of these planar units is entirely different from the covalent sixfold cubic structure in H3S and clathrate-like structure in LaH10. The Hf atom acts as a precompressor and electron donor to the hydrogen sublattice. This “penta-graphene-like” H10 structure is also found in ZrH10, ScH10 and LuH10 at high pressure, each material showing a high Tc ranging from 134 to 220 K. Our study of dense superhydrides with “penta-graphene-like” layered structures opens the door to the exploration of a new class of high Tc superconductors.
Royal Society (WM150023)
External DOI: https://doi.org/10.1103/physrevlett.125.217001
This record's URL: https://www.repository.cam.ac.uk/handle/1810/310633
All rights reserved