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  • Letter
  • Open Access

High-pressure II-III phase transition in solid hydrogen: Insights from state-of-the-art ab initio calculations

Maria Hellgren, Damian Contant, Thomas Pitts, and Michele Casula

  • Sorbonne Université, MNHN, UMR CNRS 7590, IMPMC, 4 place Jussieu, 75005 Paris, France

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Phys. Rev. Research 4, L042009 – Published 17 October, 2022

DOI: https://doi.org/10.1103/PhysRevResearch.4.L042009

Abstract

The high-pressure II-III phase transition in solid hydrogen is investigated using the random phase approximation and diffusion Monte Carlo. Good agreement between the methods is found confirming that an accurate treatment of exchange and correlation increases the transition pressure by more than 100 GPa with respect to semilocal density functional approximations. Using an optimized hybrid functional, we then reveal a low-symmetry structure for phase II generated by an out-of-plane librational instability of the C2/c phase III structure. This instability weakens the in-plane polarization of C2/c leading to the well-known experimental signatures of the II-III phase transition such as a sharp shift in vibron frequency, infrared activity, and lattice parameter ratio c/a. Finally, we discuss the zero-point vibrational energy that plays an important role in stabilizing phase III at lower pressures.

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Phys. Rev. Research 4, L042009– Published 17 October, 2022
  • Received 3 May 2022
  • Revised 28 July 2022
  • Accepted 24 August 2022
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