Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.184503
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- U.S. Department of Energy [DE-AC52-07NA27344]
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By combining diamond-anvil-cell and laser-driven shock wave techniques, we produced dense He samples up to 1.5 g/cm(3) at temperatures reaching 60 kK. Optical measurements of reflectivity and temperature show that electronic conduction in He at these conditions is temperature-activated (semi-conducting). A fit to the data suggests that the mobility gap closes with increasing density, and that hot dense He becomes metallic above similar to 1.9 g/cm(3). These data provide a benchmark to test models that describe He ionization at conditions found in astrophysical objects, such as cold white dwarf atmospheres.
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