Anomalous enhancement of nuclear spin relaxation rates of109Ag and115 in at low temperatures in cubic Γ3 ground-state system PrAg2In - First observation of octupole fluctuations of f -electrons

Hiroshi Tanida, Shigeru Takagi, Hiroyuki S. Suzuki, Isamu Satoh, Takemi Komatsubara

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Microscopic properties have been investigated on a cubic nonmagnetic non-Kramers Γ3 doublet ground-state (GS) system PrAg 2In by complementarily utilizing 115In (I = 9/2) and 109Ag (I = 1/2) NMR with particular emphasis on the low-frequency (low-ω) dipole and multipole (octupole and/or quadrupole) fluctuations of f -electrons as probed by the nuclear spin relaxation rates 1/ 115T1 and 1/109T1. We show that 1/115T1 and 1/109T1 are anomalously enhanced respectively below ≅50 K and ≅100 K over those expected for the low-ω dipole fluctuations of the excited magnetic Γ4 and Γ5 states in a simple crystalline-electric-field model for a Γ3 GS system. By comparing 1/(115T1T) and 1/(109T1T) and also by considering an invariant form of the hyperfine and/or quadrupole couplings of Γ3 octupole and/or quadrupole moments with Ag/In nuclear dipole and/or quadrupole moments, we show that Γ3 octupole fluctuations dominate 1/ 109T1 and quadrupole ones can possibly contribute to 1/115T1 at low T.

Original languageEnglish
Article number074721
Journaljournal of the physical society of japan
Issue number7
Publication statusPublished - 2006 Jul


  • Nuclear spin relaxation
  • Octupole
  • Pr compounds
  • PrAgIn
  • Quadrupole

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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