High Tc superconductivity in layered hydrides XH15 (X = Ca,Sr, Y,La) under high pressures |
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| Authors: | Yue Chen Zhengtao Liu Ziyue Lin Qiwen Jiang Mingyang Du Zihan Zhang Hao Song Hui Xie Tian Cui Defang Duan |
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| Institution: | 1. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China2. Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, China |
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| Abstract: | The theoretical predictions and experimental synthesis of H3S and LaH10 superconductors with record high superconducting transition temperatures (Tc) have promoted the hydrogen-based superconducors to be a research hotspot in the field of solid-state physics. Here, we predict an unprecedented layered structure CaH15, with high Tc of 189 K at 200 GPa using ab initio calculations. As concerns the novel structure, one layer is made of a hydrogen nonagon, the other layer consists of a Ca atom and six H2 molecular units surrounding the Ca atom. This layered structure was also found in SrH15, YH15, and LaH15 at high pressures, each materials exhibit high Tc especially YH15 can reach above 200 K at 220 GPa. It represents the second class of layered superhydrides with high value of Tc after pentagraphene like HfH10. |
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| Keywords: | high pressure hydrides superconductivity ab initio calculation |
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