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Two new phases of hydrogen have been discovered at room temperature in Ref.1:phase IV above 220 GPa and phase V above ~270 GPa. In the present work we havefound a new phase VI at P~360 GPa and T<200 K. This phase is likely metallic asfollows from the featureless Raman spectra, a strong drop in resistance, andabsence of a photoconductive response. We studied hydrogen at low temperatureswith the aid of Raman, infrared absorption, and electrical measurements atpressures up to 380 GPa, and have built a new phase diagram of hydrogen.

Low temperature phase diagram of hydrogen at pressures up to 380 GPa. A possible metallic phase at 360 GPa and 200 K