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

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.

9 pages, 12 figures

References in corpus (3)

• A superconductor to superfluid phase transition in liquid metallic hydrogen
• Density functional theory study of phase IV of solid hydrogen
• Quantum Monte Carlo study of the phase diagram of solid molecular hydrogen at extreme pressures

Cited by in corpus (21)

• Observation of the Wigner-Huntington Transition to Solid Metallic Hydrogen
• High-Temperature Superconductivity in Alkaline and Rare Earth Polyhydrides at High Pressure: A Theoretical Perspective
• Anharmonic effects in atomic hydrogen: superconductivity and lattice dynamical stability
• Search for high-Tc conventional superconductivity at megabar pressures in the lithium-sulfur system
• Coupled Electron-Ion Monte Carlo simulation of hydrogen molecular crystals
• Thermodynamic anomalies and three distinct liquid-liquid transitions in warm dense liquid hydrogen
• Energy gap closure of crystalline molecular hydrogen with pressure
• Universal diamond edge Raman scale to 0.5 terapascal: The implication to metallization of hydrogen
• A simple thermodynamic model for the hydrogen phase diagram
• Strong electron-phonon and band structure effects in the optical properties of high pressure metallic hydrogen
• Infrared Peak-Splitting from phonon localization in Solid Hydrogen
• Comments on the claimed observation of the Wigner-Huntington Transition to Metallic Hydrogen
• Phonon-mode specific contributions to room-temperature superconductivity in atomic hydrogen at high pressures
• Magnetic Flux Tailoring through Lenz Lenses in Toroidal Diamond Indenter Cells: A New Pathway to High Pressure Nuclear Magnetic Resonance
• Response to critiques on Observation of the Wigner-Huntington transition to metallic hydrogen
• Semimetallic molecular hydrogen at pressure above 350 GPa
• Comment on: Observation of a first order phase transition to metal hydrogen near 425 GPa
• Electron-Phonon Mediated Superconductivity in 1T MoS2 and Effect of Pressure on the Same
• Metallic hydrogen with a strong electron-phonon interaction at a pressure of 300-500 GPa
• No "Evidence for a new phase of dense hydrogen above 325 GPa"
• Experimental phase transition mapping for hydrogen above 300 K up to 300 GPa