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Symmetry breaking in dense solid hydrogen: mechanisms for the transitions to phase II and phase III
Pierre Tolédano1, Hannelore Katzke, Alexander F Goncharov
1Physique des Systèmes Complexes, Université de Picardie, 80000 Amiens, France.
Abstract:
Spectroscopic data for the high-pressure phases of hydrogen together with the topology of the phase diagram provide new insight on the behavior of the material at megabar pressure. Structural mechanisms are proposed for the transitions to phases II and III. These mechanisms include a partially ordered structure (possibly incommensurate) and an ordered isotranslational structure for the two phases, respectively. The analysis supports the existence of an additional phase, isostructural to phase III, with boundary that meets to form a second triple point with phases I and III.
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