Dissipation in non-Kramers doublet of PrMg 3

Koji Araki, Terutaka Goto, Keisuke Mitsumoto, Yuichi Nemoto, Mitsuhiro Akatsu, Hiroyuki S. Suzuki, Hiroshi Tanida, Shigeru Takagi, Shadi Yasin, Sergei Zherlitsyn, Joachim Wosnitza

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The low-temperature ultrasonic dispersion in the transverse (C 11 - C 12)/2 mode of PrMg 3 with the non-Kramers-doublet ground state has been investigated in temperatures down to 20 mK. The dispersion is caused by a thermally activated motions characterized by an Arrhenius-type relaxation time of τ = τ 0 exp(E/k BT) with low activation energy, E = 500 mK, and slow attempt time, τ 0 = 8.5 × 10 -10 s. The coupling of the electric quadrupoles of the non-Kramers-doublet ground state to transverse lattice vibrations leads to a vibronic ground state with dissipation. The vibronic state in PrMg 3 releases the entropy of k B ln 2 with lowering temperature across the activation energy. A Kondo-like singlet state due to the binding of the non-Kramers doublet to the lattice vibrations appears at low temperatures far below the activation energy.

Original languageEnglish
Article number023710
Journaljournal of the physical society of japan
Volume81
Issue number2
DOIs
Publication statusPublished - 2012 Feb 1

Keywords

  • Dissipation
  • Electric quadrupole
  • Kondo-like singlet
  • Non-kramers doublet
  • PrMg
  • Ultrasonic dispersion

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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