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Lattice distortion of hep solid helium under pressure

机译:压力下庚固体氦的晶格畸变

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The lattice distortion of hep solid He under pressure is calculated using semiempirical and first-principle approaches. While three-body forces tend to flatten the lattice at all compressions, the effect of pair forces changes from the flattening at small compression to elongation at large one. At large compressions, the lattice distortion due to the triple forces is more than twice as large as those due to pair forces and the lattice is slightly flattened. First-principles results show that over approximately fivefold compressions higher-order, many-body forces become important.
机译:利用半经验和第一性原理计算了堆肥He在压力下的晶格畸变。尽管三体力在所有压缩下都趋于使晶格变平,但成对力的作用从小压缩时的变平变为大压缩时的伸长。在大的压缩下,由于三重力引起的晶格畸变是由于成对力引起的晶格畸变的两倍多,并且晶格稍微变平。第一性原理结果表明,在大约五倍的压缩下,高阶多体力变得很重要。

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  • 来源
    《Physical review》 |2009年第9期|094112.1-094112.4|共4页
  • 作者单位

    B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin Avenue, Kharkov 61103, Ukraine;

    B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin Avenue, Kharkov 61103, Ukraine;

    B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin Avenue, Kharkov 61103, Ukraine;

    Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, DC 20015, USA;

    Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, Saskatchewan, Canada S7N 5E2;

    Departamento de Fisica Aplicada-ICMUV, Universitat de Valencia, c/Dr Moliner 50, E-46100 Burjassot, Spain;

    Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, DC 20015, USA;

    Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, DC 20015, USA;

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