Ultrahigh-pressure isostructural electronic transitions in hydrogen.

Abstract:

:High-pressure transitions are thought to modify hydrogen molecules to a molecular metallic solid and finally to an atomic metal1, which is predicted to have exotic physical properties and the topology of a two-component (electron and proton) superconducting superfluid condensate2,3. Therefore, understanding such transitions remains an important objective in condensed matter physics4,5. However, measurements of the crystal structure of solid hydrogen, which provides crucial information about the metallization of hydrogen under compression, are lacking for most high-pressure phases, owing to the considerable technical challenges involved in X-ray and neutron diffraction measurements under extreme conditions. Here we present a single-crystal X-ray diffraction study of solid hydrogen at pressures of up to 254 gigapascals that reveals the crystallographic nature of the transitions from phase I to phases III and IV. Under compression, hydrogen molecules remain in the hexagonal close-packed (hcp) crystal lattice structure, accompanied by a monotonic increase in anisotropy. In addition, the pressure-dependent decrease of the unit cell volume exhibits a slope change when entering phase IV, suggesting a second-order isostructural phase transition. Our results indicate that the precursor to the exotic two-component atomic hydrogen may consist of electronic transitions caused by a highly distorted hcp Brillouin zone and molecular-symmetry breaking.

journal_name

Nature

journal_title

Nature

authors

Ji C,Li B,Liu W,Smith JS,Majumdar A,Luo W,Ahuja R,Shu J,Wang J,Sinogeikin S,Meng Y,Prakapenka VB,Greenberg E,Xu R,Huang X,Yang W,Shen G,Mao WL,Mao HK

doi

10.1038/s41586-019-1565-9

subject

Has Abstract

pub_date

2019-09-01 00:00:00

pages

558-562

issue

7775

eissn

0028-0836

issn

1476-4687

pii

10.1038/s41586-019-1565-9

journal_volume

573

pub_type

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