Hyperfine Interactions in the Heavy-Fermion Superconductor Ube13: 9Be NMR Studies

• Tou Hideki

  Department of Quantum Matter, AdSM, Hiroshima University Institute for Advanced Materials Research, Hiroshima University

• Tsugawa Norihiko

  Department of Quantum Matter, AdSM, Hiroshima University

• Sera Masafumi

  Department of Quantum Matter, AdSM, Hiroshima University Institute for Advanced Materials Research, Hiroshima University

• Harima Hisatomo

  Department of Physics, Kobe University

• Haga Yoshinori

  Advanced Science Research Center, Japan Atomic Energy Agency

• Onuki Yoshichika

  Advanced Science Research Center, Japan Atomic Energy Agency Department of Physics, Graduate School of Science, Osaka University

書誌事項

タイトル別名

• Hyperfine Interactions in the Heavy-Fermion Superconductor UBe<SUB>13</SUB>: <SUP>9</SUP>Be NMR Studies

抄録

⁹Be NMR measurements have been performed for a single crystal UBe₁₃ with T_c≈0.86 K. For an applied field parallel to [001] direction, we observed a well-split ⁹Be NMR line with the sharp line-width of ≈10 Oe, guaranteeing the high-quality of the single crystal from the microscopic viewpoint. We also calculated the electric field gradient (⁹EFG) tensor at Be(II) site using the band-structure calculation based on an FLAPW-LDA method. From the field-angle dependence of ⁹Be-NMR spectra together with the result of the band-structure calculation, we identified the ⁹EFG and ⁹Be Knight shift tensors. The Knight shift of UBe₁₃ is enhanced by a factor of hundreds compared to that of a pure Be metal, suggesting the local spin density at Be 2s and 2p orbitals is enhanced through the hybridization with 5f electrons. The isotropic and anisotropic hyperfine fields are obtained as A^iso≈436 Oe/μ_B, (A_s¹,A_s²,A_s³)≈(192,44,−236) Oe/μ_B. The anisotropic part can be explained by the spin-dipolar field attributed to the local-spin-density at Be 2p orbital, and the 2p orbital perpendicular to the mirror plane [for example 2p_x for Be(IIA)] contributes mainly to the conduction band. On the other hand, the isotropic part mainly originates from the core polarization hyperfine field of the Be s shell due to the unpaired Be 2p electrons. The present results give direct evidence that the Be 2p orbital is responsible for conduction bands.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 76 (2), 024705-024705, 2007

  一般社団法人 日本物理学会

キーワード

• heavy fermion superconductor
• UBe<SUB>13</SUB>
• NMR
• Knight shift

詳細情報

• CRID: 1390001204194128256
• NII論文ID: 130005296691
• NII論文ID: 110006203525
• NII論文ID: 210000106552
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.76.024705
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 8640677
• Web Site: http://id.ndl.go.jp/bib/8640677
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8640677
• Web Site: https://journals.jps.jp/doi/pdf/10.1143/JPSJ.76.024705
• 本文言語コード: en
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