Pr化合物における非磁性基底状態が創出する多彩な低温物性

• 鬼丸 孝博

  広島大学大学院 先端物質科学研究科

書誌事項

タイトル別名

• Low Temperature Properties of Pr-based Compounds with Non-magnetic Ground State
• 受賞記事 Pr化合物における非磁性基底状態が創出する多彩な低温物性
• ジュショウ キジ Pr カゴウブツ ニ オケル ヒジセイ キテイ ジョウタイ ガ ソウシュツ スル タサイ ナ テイオン ブッセイ

抄録

Praseodymium-based compounds with a Pr³⁺ ion of 4f² configuration have effective magnetic moments of 3.6 μ_B/Pr at high temperature. However, the ground state is often non-magnetic when the Pr³⁺ ion has a nonmagnetic doublet ground state under a cubic crystal field. The twofold degeneracy is lifted by the ordering of the multipolar degrees of freedom. Such an example is PrPb₃, whose CEF ground state is the non-magnetic Γ₃ doublet. It was believed to involve an antiferroquadrupolar (AFQ) ordering at T_Q=0.4 K, where electric quadrupoles align alternatively. We have determined the order parameter and the quadrupole ordering structure in the AFQ phase by angle-resolved magnetization and neutron diffraction measurements; the quadrupole O₂⁰ is aligned with a sinusoidally modulated structure, whereas O₂² appears only at the fields higher than 6.5 T applied along the [110] direction. These suggest that the anisotropic interaction between the quadrupoles is an indirect RKKY-type interaction mediated by conduction electrons. Recently, superconductivity, structural transition and heavy fermion behavior have been observed in caged compounds PrT₂Zn₂₀ (T=Ru, Ir) with non-magnetic CEF ground states.

収録刊行物

• 波紋

  波紋 20 (3), 231-236, 2010

  日本中性子科学会

キーワード

• rare-earth compound
• multipole
• neutron diffraction
• superconductivity

詳細情報

• CRID: 1390564238045660800
• NII論文ID: 130007516731
• NII書誌ID: AA11905115
• DOI: 10.5611/hamon.20.3_231
• ISSN: 1884636X
• ISSN: 1349046X
• NDL書誌ID: 10806707
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10806707
• Web Site: https://www.jstage.jst.go.jp/article/hamon/20/3/20_231/_pdf
• 本文言語コード: ja
• データソース種別:
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  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
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