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- W2336694529 abstract "Lattice stability and metastability, as well as melting, are important features of the physics and chemistry of dense hydrogen. Using ab initio molecular dynamics (AIMD), the classical superheating limit and melting line of metallic hydrogen are investigated up to 1.5 TPa. The computations show that the classical superheating degree is about 100 K, and the classical melting curve becomes flat at a level of 350 K when beyond 500 GPa. This information allows us to estimate the well depth and the potential barriers that must be overcome when the crystal melts. Inclusion of nuclear quantum effects (NQE) using path integral molecular dynamics (PIMD) predicts that both superheating limit and melting temperature are lowered to below room temperature, but the latter never reach absolute zero. Detailed analysis indicates that the melting is thermally activated, rather than driven by pure zero-point motion (ZPM). This argument was further supported by extensive PIMD simulations, demonstrating the stability of Fddd structure against liquefaction at low temperatures." @default.
- W2336694529 created "2016-06-24" @default.
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- W2336694529 date "2015-09-02" @default.
- W2336694529 modified "2023-10-16" @default.
- W2336694529 title "Lattice stability and high-pressure melting mechanism of dense hydrogen up to 1.5 TPa" @default.
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- W2336694529 doi "https://doi.org/10.1103/physrevb.92.104103" @default.
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