Pressure Effect on the Spin Fluctuations in YMn2 Mn NQR Study

K. Nishikido, C. Thessieu, G. Q. Zheng, Y. Kitaoka, K. Asayama, R. Hauser



We report the NQR study on the pressure-induced paramagnetic state in the antiferroinagrietic (AF) intermetal-lic compound YMn2 with the Néel temperature TN=100 K at ambient pressure. Froin the T variation of the nuclear spin-lattice relaxation rate, 56(lJT1) of 55Mn above the critical pressure of 4 kbar, the spin fluctuation feature is found to change below a temperature Taf. At higher temperature than Taf, the nuclear relaxation behavior is well described in terms of the self-consistent renomalized (SCR) spin fluctuation theory for nearly AF metals, whereas below Taf a deviation is significant and 1JT1T exhibits a weak T variation. It is pointed out that Taf coincides with the temperature below which a T2 law in electrical resistivity is valid as expected for a Feimi 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 Y1−xScxMn2.

ジャーナルReview of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
出版ステータスPublished - 1998

ASJC Scopus subject areas

  • 化学一般
  • 材料科学一般
  • 凝縮系物理学


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