Theory on Crystal-Field Excitation of Paramagnetic Pr-Ion Systems with Degenerate Ground Levels and Multipolar Exchange Interactions : Origin of Two Spectral Components with Large and Small Dispersions

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The spectral line shape of inelastic neutron excitation was theoretically studied for paramagnetic Pr ion systems with crystal-field splitting and intersite exchange interactions. It was assumed that the ground level is the doublet E (Γ_3) and the excited level is the triplet T1 (Γ_4) of the cubic point group. The excitation spectra are given by the superposition of two components: One has a relatively strong intensity and a sharp peak with a large dispersion; the other shows a weak and broad peak with a small dispersion. Similar features that have been observed recently in PrMg_3 were explained by the calculation. The former component is ascribed to the usual E→T1 excitation with the dispersion due to the dipole-type exchange interaction, and the latter to a transition accompanied by the simultaneous excitation of fluctuation modes in the manifold at the ground level. Multipolar-type exchange interactions increase the intensity of the latter. The theory was developed based on Mori's memory function formalism, and a symmetrized form of a standard operator was introduced to treat the multipolar interaction systematically.

収録刊行物

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 77(12), "124714-1"-"124714-10", 2008-12-15

    一般社団法人日本物理学会

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各種コード

  • NII論文ID(NAID)
    110007021689
  • NII書誌ID(NCID)
    AA00704814
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00319015
  • NDL 記事登録ID
    9741146
  • NDL 雑誌分類
    ZM35(科学技術--物理学)
  • NDL 請求記号
    Z53-A404
  • データ提供元
    CJP書誌  NDL  NII-ELS 
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