Issue 25, 2024

Orientated hydrogen chains favor superconductivity in germanium sulfur hydrides

Abstract

Hydrogen-rich compounds, as the closest to room-temperature superconductors discovered in recent years, have attracted the research interest of scientists. Especially, the recent theory-orientated discovery of record high-temperature superconductivity (Tc ∼ 330 K) in clathrate CeH18 is an important advancement toward room-temperature superconductors. In this work, we systematically investigated the phase diagram, stability, and superconducting properties of GeSHx compounds (x = 7, 8, 10, 12, 14 and 16) under compression. Here we report a superconductive structure of GeSH14 with the P21/m space group, possessing a predicted critical temperature Tc of 128 K at 180 GPa. Strikingly, P21/m GeSH14 is composed of orientated hydrogen chains bridging the adjacent Ge–S–H polyhedron layers, and is distinctly different from the typical clathrate structure in most high-Tc hydrides. Moreover, the hydrogen components mainly exist in the form of covalent atomic chains, which is crucial for stabilizing the hydrogen-rich compound and is favorable for superconductivity. The role of hydrogen atomic chains in the superconductivity is investigated extensively, and the superconducting mechanism of high-Tc is further explored. This work provides a new way of searching for high-temperature hydrogen-rich superconductors.

Graphical abstract: Orientated hydrogen chains favor superconductivity in germanium sulfur hydrides

Supplementary files

Article information

Article type
Paper
Submitted
06 Feb 2024
Accepted
12 May 2024
First published
14 May 2024

J. Mater. Chem. C, 2024,12, 9158-9164

Orientated hydrogen chains favor superconductivity in germanium sulfur hydrides

X. Wang, X. Tang, L. Shi, X. Chen and X. Liu, J. Mater. Chem. C, 2024, 12, 9158 DOI: 10.1039/D4TC00511B

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