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High-pressure structure and electronic properties of YbD_2 to 34 GPa

机译:YBD_2至34 GPA的高压结构和电子性质

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摘要

Ytterbium dihydride (YbH2) shows a well-known transition at approximate to 16 GPa from a CaH2-type structure to a high-pressure (high-P) phase with Yb at hcp sites and unknown H positions. Here, we report its complete structure determination by neutron diffraction at 34 GPa. Hydrogen (deuterium) is located at 2a and 2d positions of space group P6(3)/mmc, thus forming a high-symmetry "collapsed" close-packed lattice. The transition is sluggish and can be seen as a transfer of 1/2 of the hydrogen atoms from strongly corrugated H layers to interstitial sites of the Yb lattice. We demonstrate by first-principles calculations that the transition is related to a change from a completely filled f-electron configuration to a fractional f-hole (approximate to 0.25 h) occupation in the high-P phase. The f - d charge transfer closes the gap at the transition and leads to a metallic ground state with a sizable electron-phonon interaction involving out-of-plane vibrational modes of interstitial hydrogen.
机译:yTTerbium二氢吡啶(YbH2)显示了从CaH 2型结构的近似16GPa的近似转变,在HCP位点和未知的H位置处用YB与Yb的高压(高p)相。在这里,我们通过34GPa的中子衍射报告其完全结构测定。氢气(氘)位于空间组P6(3)/ MMC的2A和2D位置,从而形成高对称性“塌陷”封闭式晶格。转变是缓慢的,可以被视为从强烈瓦楞升层的1/2的氢原子转移到YB格子的间质位置。我们通过第一原理证明了转变与从完全填充的F电子配置的变化与高P阶段中的分数F孔(近似为0.25小时)的变化有关。 F - > D电荷转移闭合过渡处的间隙,并导致金属接地状态,具有可涉及间质氢的平面外振动模式的相当化的电子 - 声子相互作用。

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  • 来源
    《Physical review》 |2019年第2期|020101.1-020101.5|共5页
  • 作者单位

    Sorbonne Univ IMPMC CNRS UMR 7590 4 Pl Jussieu F-75252 Paris France;

    Sorbonne Univ IMPMC CNRS UMR 7590 4 Pl Jussieu F-75252 Paris France;

    Univ Tokyo Geochem Res Ctr Grad Sch Sci Bunkyo Ku 7-3-1 Hongo Tokyo 1130033 Japan;

    Neutron Sci & Technol Ctr CROSS 162-1 Shirakata Tokai Ibaraki 3191106 Japan;

    Japan Atom Energy Agcy J PARC Ctr 2-4 Shirakata Tokai Ibaraki 3191195 Japan;

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