  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 have
found a new phase VI at P~360 GPa and T<200 K. This phase is likely metallic as
follows from the featureless Raman spectra, a strong drop in resistance, and
absence of a photoconductive response. We studied hydrogen at low temperatures
with the aid of Raman, infrared absorption, and electrical measurements at
pressures up to 380 GPa, and have built a new phase diagram of hydrogen.
