期刊
NATURE COMMUNICATIONS
卷 4, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms3064
关键词
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资金
- MOST [2013CB934600]
- NSFC [11275008, 91021007, 10974238]
- European Research Council
- Royal Society through a Royal Society Wolfson Research Merit Award
- EPSRC
- EPSRC [EP/F032773/1, EP/K014560/1, EP/G007489/2, EP/F013612/1, EP/K013564/1, EP/J017639/1, EP/K013688/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F032773/1, EP/K014560/1, EP/K013688/1, EP/K013564/1, EP/J017639/1, EP/G007489/2, EP/F013612/1] Funding Source: researchfish
The melting temperature of solid hydrogen drops with pressure above similar to 65 GPa, suggesting that a liquid state might exist at low temperatures. It has also been suggested that this low-temperature liquid state might be non-molecular and metallic, although evidence for such behaviour is lacking. Here we report results for hydrogen at high pressures using ab initio methods, which include a description of the quantum motion of the protons. We determine the melting temperature as a function of pressure and find an atomic solid phase from 500 to 800 GPa, which melts at <200 K. Beyond this and up to 1,200 GPa, a metallic atomic liquid is stable at temperatures as low as 50 K. The quantum motion of the protons is critical to the low melting temperature reported, as simulations with classical nuclei lead to considerably higher melting temperatures of similar to 300 K across the entire pressure range considered.
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