Electrical Conductivity and Metallization of Fluid Hydrogen in the Pressure Range 90-180 GPa(0.9-1.8Mbar)

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Conductivity measurements indicate that hydrogen becomes a metallic fluid at 140 GPa, ninefold initial liquid density, and ∼3000 K. Metallization occurs when the electronic energy gap E<SUB>g</SUB> is reduced by pressure to k<SUB>B</SUB>T . High pressures and temperatures were obtained by a shock wave reverberating in hydrogen between stiff Al<SUB>2</SUB>O<SUB>3</SUB> anvils. Resistivity decreases four orders of magnitude from 93 to 140 GPa and is constant from 140 to 180 GPa. About ∼5% of the H<SUB>2</SUB> molecules are dissociated at metallization . The free-electron Fermi energy is ∼12 ev. The measured conductivities of hydrogen are essentially the same as those of fluid Cs and Rb at 2000 K undergoing the same transition. The transition to the metal occurs at a Mott-scaled density of D<SUB>m</SUB><SUP>1/3</SUP>a*=0. 30, where D<SUB>m</SUB> is the metallization density and a* is the Bohr radius of the molecule. The measured metallic conductivity is in good agreement with (1) the calculated minimum conductivity of a metal, (2) the conductivity of hydrogen calculated with the strong-scattering free-electron model, (3) a preliminary calculation by Louis and Ashcroft using the weak-scattering Ziman model for a molecular liquid metal, and (4) tight-binding molecular dynamics calculations by Lenosky et al.

収録刊行物

  • 高圧力の科学と技術 = The Review of high pressure science and technology

    高圧力の科学と技術 = The Review of high pressure science and technology 7, 870-872, 1998

    The Japan Society of High Pressure Science and Technology

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各種コード

  • NII論文ID(NAID)
    10002692151
  • NII書誌ID(NCID)
    AN10452913
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    0917639X
  • NDL 記事登録ID
    4494086
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z17-1589
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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