Superconductivity of novel tin hydrides (SnnHm) under pressure

M. Mahdi Davari Esfahani, Zhenhai Wang, Artem R. Oganov, Huafeng Dong, Qiang Zhu, Shengnan Wang, Maksim S. Rakitin, Xiang Feng Zhou

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

With the motivation of discovering high-temperature superconductors, evolutionary algorithm USPEX is employed to search for all stable compounds in the Sn-H system. In addition to the traditional SnH4, new hydrides SnH8, SnH12 and SnH14 are found to be thermodynamically stable at high pressure. Dynamical stability and superconductivity of tin hydrides are systematically investigated. I4¯m2-SnH8, C2/m-SnH12 and C2/m-SnH14 exhibit higher superconducting transition temperatures of 81, 93 and 97 K compared to the traditional compound SnH4 with Tc of 52 K at 200 GPa. An interesting bent H3-group in I4¯m2-SnH8 and novel linear H4¯ in C2/m-SnH12 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 H2 and H3.

Original languageEnglish
Article number22873
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - 11 Mar 2016

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