Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.125501
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Funding
- U.K. Engineering and Physical Sciences Research Council
- Institute of the Shock Physics, Imperial College
- EPSRC CM-DTC
- NSF
- Army Research Office
- NAI
- EFRee
- Engineering and Physical Sciences Research Council [EP/J003999/1] Funding Source: researchfish
- EPSRC [EP/J003999/1] Funding Source: UKRI
- Directorate For Geosciences
- Division Of Earth Sciences [0842057, 1015239] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1039807] Funding Source: National Science Foundation
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We used Raman and visible transmission spectroscopy to investigate dense hydrogen (deuterium) up to 315 (275) GPa at 300 K. At around 200 GPa, we observe the phase transformation, which we attribute to phase III, previously observed only at low temperatures. This is succeeded at 220 GPa by a reversible transformation to a new phase, IV, characterized by the simultaneous appearance of the second vibrational fundamental and newlow-frequency phonon excitations and a dramatic softening and broadening of the first vibrational fundamental mode. The optical transmission spectra of phase IV show an overall increase of absorption and a closing band gap which reaches 1.8 eVat 315 GPa. Analysis of the Raman spectra suggests that phase IV is a mixture of graphenelike layers, consisting of elongated H-2 dimers experiencing large pairing fluctuations, and unbound H-2 molecules.
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