Superconductivity of novel tin hydrides (SnnHm) under pressure

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 SnH 4 , new hydrides SnH 8 , SnH 12 and SnH 14 are found to be thermodynamically stable at high pressure...

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Bibliographic Details
Published in:Scientific reports 2016-03, Vol.6 (1), p.22873, Article 22873
Main Authors: Mahdi Davari Esfahani, M., Wang, Zhenhai, Oganov, Artem R., Dong, Huafeng, Zhu, Qiang, Wang, Shengnan, Rakitin, Maksim S., Zhou, Xiang-Feng
Format: Article
Language:English
Subjects:
639/301/1034/1037
639/301/119/1003
639/766/119/1003
H system
High pressure
High temperature
Humanities and Social Sciences
Motivation
multidisciplinary
Pressure
Science
Superconductors
Temperature effects
Tin
Transition temperatures
Vibrations
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Summary: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 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 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 SnH4 with T c of 52 K at 200 GPa. An interesting bent H 3 –group in I m2-SnH 8 and novel linear H 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 H2 and H3.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep22873