Design Principles for High-Temperature Superconductors with a Hydrogen-Based Alloy Backbone at Moderate Pressure.
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Authors
Zhang, Zihan
Cui, Tian
Hutcheon, Michael J
Shipley, Alice M
Song, Hao
Du, Mingyang
Kresin, Vladimir Z
Duan, Defang
Yao, Yansun
Publication Date
2022-01-28Journal Title
Phys Rev Lett
ISSN
0031-9007
Publisher
American Physical Society (APS)
Type
Article
This Version
AM
Metadata
Show full item recordCitation
Zhang, Z., Cui, T., Hutcheon, M. J., Shipley, A. M., Song, H., Du, M., Kresin, V. Z., et al. (2022). Design Principles for High-Temperature Superconductors with a Hydrogen-Based Alloy Backbone at Moderate Pressure.. Phys Rev Lett https://doi.org/10.1103/PhysRevLett.128.047001
Abstract
Hydrogen-based superconductors provide a route to the long-sought goal of room-temperature superconductivity, but the high pressures required to metallize these materials limit their immediate application. For example, carbonaceous sulfur hydride, the first room-temperature superconductor made in a laboratory, can reach a critical temperature (T_{c}) of 288 K only at the extreme pressure of 267 GPa. The next recognized challenge is the realization of room-temperature superconductivity at significantly lower pressures. Here, we propose a strategy for the rational design of high-temperature superconductors at low pressures by alloying small-radius elements and hydrogen to form ternary H-based superconductors with alloy backbones. We identify a "fluorite-type" backbone in compositions of the form AXH_{8}, which exhibit high-temperature superconductivity at moderate pressures compared with other reported hydrogen-based superconductors. The Fm3[over ¯]m phase of LaBeH_{8}, with a fluorite-type H-Be alloy backbone, is predicted to be thermodynamically stable above 98 GPa, and dynamically stable down to 20 GPa with a high T_{c}∼185 K. This is substantially lower than the synthesis pressure required by the geometrically similar clathrate hydride LaH_{10} (170 GPa). Our approach paves the way for finding high-T_{c} ternary H-based superconductors at conditions close to ambient pressures.
Sponsorship
Engineering and Physical Sciences Research Council (EP/P022596/1)
Engineering and Physical Sciences Research Council (EP/L015552/1)
Identifiers
External DOI: https://doi.org/10.1103/PhysRevLett.128.047001
This record's URL: https://www.repository.cam.ac.uk/handle/1810/331956
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