Pressure Effect on the Spin Fluctuations in YMn2 Mn NQR Study

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

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)626-628
Number of pages3
JournalReview of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
Volume7
DOIs
Publication statusPublished - 1998
Externally publishedYes

Fingerprint

Spin fluctuations
Pressure effects
pressure effects
nuclear relaxation
fluctuation theory
Temperature
Spin-lattice relaxation
critical pressure
tetrahedrons
spin-lattice relaxation
nuclear spin
Ground state
temperature
Neutrons
Metals
deviation
neutrons
electrical resistivity
ground state
Liquids

Keywords

  • Antiferromagnetic Spin Fluctuation
  • Hydrostatic Pressure
  • Nuclear Magnetic Resonance

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Pressure Effect on the Spin Fluctuations in YMn2 Mn NQR Study. / Nishikido, K.; Thessieu, C.; Zheng, G. Q.; Kitaoka, Y.; Asayama, K.; Hauser, R.

In: Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu, Vol. 7, 1998, p. 626-628.

Research output: Contribution to journalArticle

Nishikido, K. ; Thessieu, C. ; Zheng, G. Q. ; Kitaoka, Y. ; Asayama, K. ; Hauser, R. / Pressure Effect on the Spin Fluctuations in YMn2 Mn NQR Study. In: Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu. 1998 ; Vol. 7. pp. 626-628.
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AU - Asayama, K.

AU - Hauser, R.

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AB - 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.

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