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Critical behavior in the hydrogen insulator-metal transitionThe vibrational Raman spectrum of solid hydrogen has been measured from 77 to 295 K in the vicinity of the recently observed insulator-metal transition and low-temperature phase transition at 150 gigapascals. The measurements provide evidence for a critical point in the pressure-temperature phase boundary of the low-temperature transition. The result suggests that below the critical temperature the insulator-metal transition changes from continuous to discontinuous, consistent with the general criteria originally proposed by Mott (1949) for metallization by band-gap closure. The effect of temperature on hydrogen metallization closely resembles that of the lower-pressure insulator-metal transitions in doped V2O3 alloys.
Document ID
19900056331
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hemley, R. J.
(Carnegie Institution of Washington Washington, DC, United States)
Mao, H. K.
(Carnegie Institution of Washington Washington, DC, United States)
Date Acquired
August 14, 2013
Publication Date
July 27, 1990
Publication Information
Publication: Science
Volume: 249
ISSN: 0036-8075
Subject Category
Solid-State Physics
Accession Number
90A43386
Funding Number(s)
CONTRACT_GRANT: NSF EAR-87-20320
CONTRACT_GRANT: NSF EAR-86-10086
CONTRACT_GRANT: NSF DMR-89-12226
CONTRACT_GRANT: NAGW-1722
Distribution Limits
Public
Copyright
Other

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