Pressure Effect on the Spin Fluctuation in YMn2:Mn NQR Study

• Nishikido K.

  Department o f Material Physics, Osaka University

• Thessieu C.

  Department o f Material Physics, Osaka University

• Zheng G-q.

  Department o f Material Physics, Osaka University

• Kitaoka Y.

  Department o f Material Physics, Osaka University

• Asayama K.

• Hauser R.

  Institut für Experimentalphysik, Technische Universität Wien

書誌事項

タイトル別名

• Pressure Effect on the Spin Fluctuations in YMn2. Mn NQR Study.
• Pressure Emect on the Spin Fluctuation
• Mn NQR Study

抄録

We report the NQR study on the pressure-induced paramagnetic state in the antiferromagnetic (AF) intermetallic compound YMn₂ with the Néel temperature T_N =100 K at ambient pressure. From the T variation of the nuclear spin-lattice relaxation rate, ⁵⁵ (1/T₁) of ⁵⁵Mn above the critical pressure of 4 kbar, the spin fluctuation feature is found to change below a temperature T_sf. At higher temperature than T_sf, the nuclear relaxation behavior is well described in terms of the self-consistent renomalized (SCR) spin fluctuation theory for nearly AF metals, whereas below T_sf a deviation is significant and 1/T₁T exhibits a weak T variation. It is pointed out that T_sf coincides with the temperature below which a T² law in electrical resistivlty is valid as expected for a Fermi liquid ground state. We proposed that these features are understood from the standpoint that the development of AF spin fluctuation remains in short-range associated with the singlet formation among Mn spins in each tetrahedron as suggested by the inelastic neutron experiments on Y_1-xSc_xMn₂.

収録刊行物

• 高圧力の科学と技術

  高圧力の科学と技術 7 626-628, 1998

  日本高圧力学会

キーワード

• Antiferromagnetic Spin Fluctuation
• Nuclear Magnetic Resonance
• Hydrostatic Pressure

詳細情報

• CRID: 1390001204381382656
• NII論文ID: 10002691234
• NII書誌ID: AN10452913
• DOI: 10.4131/jshpreview.7.626
• ISSN: 13481940
• ISSN: 0917639X
• NDL書誌ID: 4494003
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4494003
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可