Superconductivity of novel tin hydrides (Sn${}_n$H${}_m$) under pressure

Abstract

With the motivation of discovering high-temperature superconductors, evolutionary algorithm is employed to search for all stable compounds in the Sn-H system. In addition to the traditional SnH${}_4$, new hydrides SnH${}_8$, SnH${}_{12}$ and SnH${}_{14}$ are found to be thermodynamically stable at high pressure. Dynamical stability and superconductivity of tin-hydrides are systematically investigated. I$\bar{4}$m2-SnH${}_8$, C2/m-SnH${}_{12}$ and C2/m-SnH${}_{14}$ exhibit higher superconducting transition temperatures of 81, 93 and 97 K compared to the traditional compound SnH${}_4$ with T${}_c$ of 52 K at 200 GPa. An interesting bent H${}_3^{-}$ in I$\bar{4}$m2-SnH${}_8$ and novel liner H${}_4^{-}$ in C2/m-SnH${}_{12}$ are observed. All the new tin-hydrides remain metallic over their predicted range of stability. The intermediate-frequency wagging and bending vibrations have more contribution to electron-phonon coupling parameter than high-frequency stretching vibrations of H${}_2$ and H${}_3$.

8 pages, 4 figures

References in corpus (6)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Conventional superconductivity at 203 K at high pressures
• Superconductive "sodalite"-like clathrate calcium hydride at high pressures
• Pressure-induced decomposition of solid hydrogen sulfide
• Tellurium Hydrides at High Pressures: High-temperature Superconductors
• Phase Diagram and High-Temperature Superconductivity of Compressed Selenium Hydrides

Cited by in corpus (18)

• Synthesis of clathrate cerium superhydride CeH9 below 100 GPa with atomic hydrogen sublattice
• A Perspective on Conventional High-Temperature Superconductors at High Pressure: Methods and Materials
• High-Temperature Superconductivity in Th-H System at Pressure Conditions
• Strong correlation between bonding network and critical temperature in hydrogen-based superconductors
• High-throughput discovery of high-temperature conventional superconductors
• Materials informatics based on evolutionary algorithms: Application to search for superconducting hydrogen compounds
• Iron superhydrides FeH5 and FeH6: stability, electronic properties and superconductivity
• The Search for Superconductivity in High Pressure Hydrides
• High-temperature superconductivity in hydrides
• Non-Fermi-Liquid Behavior of Superconducting SnH${}_4$
• Prediction of Stable Ground-State Lithium Polyhydrides under High Pressures
• High-Temperature Superconductivity in the Ti--H System at High Pressures
• Superconductivity and unexpected chemistry of germanium hydrides under pressure
• Weyl holographic superconductor in the Lifshitz black hole background
• Novel magnesium borides and their superconductivity
• Comparison of highly-compressed C2/m-SnH12 superhydride with conventional superconductors
• Hydrogen in superconductors
• Titanium-hydrogen interaction at megabar pressure