High-Pressure NMR Study of Heavy Fermion Spinel LiV2O 4

Kenji Fujiwara, Yoshiyuki Shimaoka, Tatsuo Kobayashi

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3 Citations (Scopus)

Abstract

We have developed high-pressure NMR technique with an Indenter Cell using NiCrA1 alloy. It was designed to set easily into a conventional dilution fridge and/or high field magnet. We have succeeded in 7Li-NMR measurement of a heavy fermion spinel LiV2O4 in T-range between 60 mK and 30 K under pressure up to 4.7 GPa. At ambient pressure, 1/T 1shows a broad maximum around 50 K and is proportional to the temperature below 6 K. This is quite similar to the relaxation behavior in f-electron HF systems. However, 1/T1T becomes larger with applying higher pressure below 10 K and does not obey T1T = constant relation down to 1 K. Knight shift K, meanwhile, is independent of pressure above 2 GPa, indicating that the uniform component of susceptibility χ(0) does not change under high pressure. Some antiferromagnetic fluctuations with wave vector q ≠ 0 dominate relaxation rate in LiV2O4 near the boundary of the pressure induced insulating phase.

Original languageEnglish
Pages (from-to)314-319
Number of pages6
JournalReview of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
Volume13
Issue number4
Publication statusPublished - 2003
Externally publishedYes

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Keywords

  • Indenter Cell
  • LiVO
  • Metal-Insulator Transition
  • NMR
  • Spin Dynamics

ASJC Scopus subject areas

  • Chemistry (miscellaneous)

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