Metallization of Hydrogen Under High Pressure: Challenges and Experimental Progress

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Abstract
Hydrogen, the first element in the periodic table, is predicted to become metallic at extremely high‐pressure conditions. Solid metallic hydrogen is believed to possess extraordinary physical properties, such as room‐temperature superconductivity and superfluidity, earning it the title of the “holy grail” in high‐pressure research. The pursuit of solid metallic hydrogen has spanned nine decades. Despite numerous fascinating discoveries related to dense hydrogen, metallic hydrogen has yet to be experimentally realized. This article aims to provide an overview of the major progress made in this field and offers an outlook on future developments.
Funding Information
  • National Natural Science Foundation of China (52288102)
  • National Natural Science Foundation of China (52090020)
  • National Natural Science Foundation of China (11874076)
  • National Natural Science Foundation of China (52372261)
  • Natural Science Foundation of Hebei Province (E2024203045)

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