209Bi-NQR investigation of the non-magnetic heavy-fermion compound CeRhBi

Yu Kawasaki, Yutaka Kishimoto, Noritaka Imai, Takashi Ohno, Hidenori Kubo, Shunsuke Yoshii, Mitsuo Kasaya

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5 Citations (Scopus)

Abstract

We report the results of 209Bi-NQR measurements on the heavy-fermion compound CeRhBi with the large electronic specific heat coefficient γ ∼ 500 mJ/mol·K2 at 2 K. From the Bi-NQR spectra, it is proved that no magnetic ordering occurs down to 0.15 K. The temperature dependence of nuclear spin-lattice relaxation rate 1/T 1 clearly demonstrates a crossover from a localized regime at high temperature to an itinerant ground state with the Kondo temperature T K of about 8 K. It is, therefore, revealed that CeRhBi is a typical heavy-fermion compound with a non-magnetic ground state, closely located at a quantum critical point. In the context of CeRhPn (Pn = Bi, Sb, As) series, where all compounds crystallize in the same orthorhombic ε-TiNiSi-type structure, no trace of gap formation is observed in 1/T1 down to 0.2 K in CeRhBi, although the values of 1/T1 in the Kondo semiconductors CeRhSb and CeRhAs markedly decrease at low temperatures due to the presence of excitation gap.

Original languageEnglish
Pages (from-to)694-697
Number of pages4
Journaljournal of the physical society of japan
Volume73
Issue number3
DOIs
Publication statusPublished - 2004 Mar 1

Keywords

  • CeRhBi
  • Heavy-fermion compound
  • Kondo insulator
  • Nuclear quadrupole resonance

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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