New low temperature phase in dense hydrogen: The phase diagram to 421 GPa

In the quest to make metallic hydrogen at low temperatures a rich number of new phases have been found and the highest pressure ones have somewhat flat phase lines, around room temperature. We have studied hydrogen to static pressures of GPa in a diamond anvil cell and down to liquid helium temperat...

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Bibliographic Details
Published inarXiv.org
Main Authors Dias, Ranga, Noked, Ori, Silvera, Isaac F
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 26.05.2016
Subjects
Darkening
Diamond anvil cells
Hydrogen
Liquid helium
Metallic hydrogen
Phase diagrams
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Summary:In the quest to make metallic hydrogen at low temperatures a rich number of new phases have been found and the highest pressure ones have somewhat flat phase lines, around room temperature. We have studied hydrogen to static pressures of GPa in a diamond anvil cell and down to liquid helium temperatures, using infrared spectroscopy. We report a new phase at a pressure of GPa and T=5 K. Although we observe strong darkening of the sample in the visible, we have no evidence that this phase is metallic hydrogen.
ISSN:2331-8422