Comment asserts that claimed metallic hydrogen at 425 GPa provides no new evidence of the insulator-metal transition and prior studies already reported comparable results.
Low temperature phase diagram of hydrogen at pressures up to 380 GPa. A possible metallic phase at 360 GPa and 200 K
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abstract
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.
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Comment on: Observation of a first order phase transition to metal hydrogen near 425 GPa
Comment asserts that claimed metallic hydrogen at 425 GPa provides no new evidence of the insulator-metal transition and prior studies already reported comparable results.